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Mechanism of bleaching teeth

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Mechanism of Teeth Bleaching & The Methods of Teeth Whitening. Another name for teeth whitening used by the dentists predominantly is 'Dental Bleaching'. It is nothing but a commonly used methodology in dentistry or so called cosmetic dentistry to restore the natural color of the teeth. There have been certain reservations from FDA though. Tooth-bleaching: Mechanism, Biological . Aspects and Antioxidants. V Tamara Perchyonok 1 and Sias R Grobler 2. 1 VTPCHEM PTY LTD, Glenhuntly, 3163, Australia It is unknown whether peroxide radicals make teeth whiter by deproteinizing, demineralizing, or oxidizing tooth tissues. This study was designed to define the mechanism of tooth bleaching and determine which of tooth enamel chemical components is/are affected by bleaching The mechanisms that would account for the tooth sensitivity after external tooth bleaching have not yet been fully established. In vitro experiments have shown that peroxide penetrated enamel and dentin and entered the pulp chamber [71] and that the penetration of restored teeth was higher than that of intact teeth [72]

Mechanism of tooth bleaching Bleaching is a decolourisation or whitening process that can occur in solution or on a surface Mechanism of tooth bleaching Bleaching is a decolourisation or whitening process that can occurinsolutionoronasurface.25 The colour producing materials in solution or on a surface are typically organic compounds that possess extended conjugated chains of alternating single or double bonds and often includ

Mechanism of Teeth Bleaching & The Methods of Teeth Whitenin

The bleaching mechanism in this case takes place by chemical degradation of the unsaturated quinone-type structures found in tetracycline, leading to fewer colored molecules (Feinman et al., 1991). Vital bleaching via a long-term night guard can sometimes improve the color of tetracycline-stained teeth (Leonard et al., 2003) The three most popular techniques for nonvital tooth bleaching are the walking bleach technique, inside/outside bleaching, and in-office bleaching. The walking bleach technique is a relatively reliable, fairly simple technique for dentists and patients Bleaching, discoloration, in-office inbleaching, root filled teeth, thermocatalytic propertiestechnique, walking bleach tech-nique History of Bleaching Teeth Reports on bleaching discolored nonvital teeth were first described during the middle of the 19th century(1) , advocating different chemical agents(2) . Initially The American Dental Association (ADA) monitors the use of these various tooth-whitening products. Despite the diversity, there are two basic mechanisms of action to whiten teeth. The non-bleaching products, such as whitening toothpastes, contain chemical agents, which simply remove surface stains and debris in order to restore the tooth's.

(PDF) Tooth-bleaching: Mechanism, Biological Aspects and

  1. understand dental bleaching. how it whitens the tooth and what do we do to bleach our teeth..how bleaching of root canal treated teeth is done? what are th..
  2. While the charcoal effect on the surface is likely to be a result of abrasivity or brushing movements, CP mechanism of action may be responsible for roughness alterations. 2, 10 The CP is combined..
  3. The mechanism of teeth whitening Chemicals used may have oxidizing or reducing effect on the molecules that cause discoloration. These chemicals (modern whitening preparations mostly contain oxidants) penetrate through the hard dental tissues where oxidize large pigment particles that have caused discoloration
  4. The mechanism that underlies tooth whitening with the use of peroxide‐based materials is a complex phenomenon encompassing diffusion, interaction, and surfaces changes within the tooth. Therefore, supervision by dental health professionals as recommended by the ADA Council on Scientific Affairs is imperative to achieve a successful and safe.
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bleaching-teeth – Macclesfield Dental14Pcs/7Pair 3D White Gel Teeth Whitening Strips Easy

Hydrogen peroxide whitens teeth by oxidizing the organic

Tooth-bleaching: Mechanism, Biological Aspects and

About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. The mechanism of whitening. Quality tooth whitening is based on the principle of atomic oxygen extraction from hydrogen peroxide. Under the influence of the cold light of the specialized LED-lamp, there is a reaction of the splitting of hydrogen peroxide molecule on hydrogen molecule and atomic oxygen molecule which in turn, getting on an. Therefore, the anterior teeth of children often darken first, whereas the posterior teeth, because of reduced exposure to sunlight, darken more slowly. 10 In adults, however, natural photobleaching of the anterior teeth (see the preceding section on Mechanism section under Tetracycline Staining) has been observed, particularly in individuals. The scope is the external bleaching of vital teeth and focuses on mechanisms; in vivo and in vitro measurement methods, and factors influencing the efficacy of the whitening process. Sources Medline and ISI Web of Science databases from 1966 and 1974, respectively were searched electronically with key words tooth, teeth, colo*r.

Mechanism of tooth bleaching - Teeth Bleachin

  1. Bleaching the tetracycline-stained tooth may be the first option to see how well it lightens the tooth. The lighter the tooth encourages the more successful of an outcome with veneers or crowns. If the tooth doesn't lighten enough for a positive result in placing a restoration, then removing healthy enamel is the other option
  2. The first reports concerning bleaching of discolored non-vital teeth were published in the middle of the 19th century. 2, 3. Different chemical agents were used to bleach discolored teeth such as chlorinated lime, oxalic acid, acetic acid, chlorine compounds and solutions, sodium peroxide, sodium hypochlorite, different concentrations of.
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  4. For tetracycline stained teeth, the colour is derived from photo-oxidation of tetracycline molecules bound within the tooth structures. 38 In some cases, it is possible to bleach these teeth to give significant and long lasting tooth whitening. 39 The mechanism by which peroxide affects the tetracycline stain is considered to be by chemical.

All 65 tooth specimens were then randomly divided into five groups ( n = 13) according to bleaching procedures. For control group, no bleaching agent was applied. For PB Opal group (Opalescence PF 15%), PB Voco group (VOCO Perfect Bleach 10% gel), and nonprescription OTC WL group (Whitelight Tooth Whitening Set gel), the bleaching agents were applied on tooth specimens approximately 1 mm thick. Similarity of results is possible because the mechanism of action is the same: oxidation of organic pigments or chromogens in the tooth. Granted, some bleaching approaches are more expeditious. Although both techniques are designed to improve the appearance of teeth, it is known that their action mechanism is different. The microabrasion technique removes stain from the affected enamel, while bleaching involves the application of an oxidizing agent that penetrates the enamel and dentin resulting in teeth whitening Tooth Whitening Products means that the dissolution of stuck on stains by hydrogen peroxide and acids is the primary mechanism of tooth whitening in Crest whitestrips. Ironically, to keep your teeth healthiest you do not want to expose your teeth to acids more than you have to, and you want to preserve your enamel pellicle for its acid.

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Tooth-bleaching procedures and their controversial effects

Similar to a whitening kit, this procedure uses a combination of light and a serum or gel. The difference is that the concentration of the active ingredient will be higher at the office. Your gums and lips will be covered with a protective gel or rubber shield. A gel or serum will be applied to your teeth. A laser light will shine onto them Tooth whitening is a mechanism for reimposing the color of the tooth. It is the process of the removal of the stain or dirt to the tooth and cannot be easily removed by brushing the teeth. As long as dentists advice is taken , teeth whitening is a safest process. Teeth whitening at roanoke gives such a treatment with no pain and easily done 10% carbamide peroxide (CP) is the most thoroughly researched CP formulation and is widely preferred over HP for therapeutic use. Composed of 6.5% urea and 3.5% peroxide, 10% CP is active up to 10 hours in the mouth, while hydrogen peroxide is only active for 30 to 60 minutes.5 It further removes plaque, kills bacteria and elevates the mouth.

Both the office and OPHB methods will generate the same result if used as recommended. The only difference between the two is. A problem with tooth sensitivity, which is a common side effect of teeth whitening treatments, is unlikely to occur with this method of teeth whitening. The Mechanism Firstly, the teeth are cleaned and all the plaque is removed prior to the teeth whitening process Mechanism of Vital tooth bleaching - bleaching products breakdown and penetrate enamel and dentin reaching the pup within 5-15 minutes - bleaching products break down larger pigmented molecules - oxygen released changes optical qualities of tooth color. Materials used for vital tooth bleaching (5

Non-Vital Walking Bleach: Opalescence Endo non-vital whitening gel is formulated specifically to whiten endodontically treated discolored teeth using the walking bleach technique. Once Opalescence Endo gel is delivered to the pulp chamber, it should be sealed with a temporary cement, and left in the tooth for one to five days. 35% hydrogen peroxide Easy to place inside pulp chamber 1. Teeth whitening products are considered cosmetics in the EU and have to comply with the Cosmetics Regulation (EC) 1223/2009 on cosmetic products. The use of a common teeth whitening ingredient, hydrogen peroxide, is restricted for use in cosmetics in the EU and can be found in Annex III (entry 12) of the cosmetic regulation How Does Teeth Whitening Work? While the actual mechanism of whitening varies by treatment type, whitening teeth, in general, is a process of using a dental teeth bleaching agent to penetrate the enamel layer of the teeth and break apart the molecules causing the discoloration.Some systems rely on bleaching compounds alone, while others incorporate UV light and other tools to achieve a fast. Tooth whitening (or oral hygiene) products for home use (in the European Union) cannot contain more than 0.1% of hydrogen peroxide (or equivalent amounts of carbamide peroxide). In the USA much higher concentrations (3-6% hydrogen peroxide) 27 are instead present in OTC products for home use. These include teeth whitening strips, paint-on. Tooth whitening or tooth bleaching is the process of lightening the color of human teeth. Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic color of the tooth enamel. The chemical degradation of the chromogens within or on the tooth is termed as bleaching

Bleaching and related agents | Pocket Dentistry

Teeth Whitening is the cosmetic dental procedure to effectively lighten and brighten teeth by bleaching out stains and discoloration from the internal teeth surface. This treatment effectively transforms a dull looking smile into a bright luminous one. It is an easy and painless procedure to achieve the pearly white smile of your dreams Working whitening mechanism The Beconfident whitening effect comes partly from dissolution of stains on the surface of the tooth as well as oxidizing organic compounds causing discolorations deeper in the enamel and dentine. The formulation consists of a combination of cleaning substances (surfactants, Surface Active Agents) and actively whitening free carbonates released from the gel [ OBJECTIVE: To investigate the mechanism of discoloration and the efficacy of bleaching in non-infected traumatically discolored teeth. METHODS: In vitro model of discolored teeth: sample of fresh erythrocytes was placed in the pulp cavity of 20 extracted teeth and centrifuged for 3 consecutive days Temp -13, Contrast +20, Whites +9 and Saturation -28. These settings will successfully whiten the teeth on your pictures. STEP 3. To have a planned result, you need to select the correct brush size. If you choose a large brush size, then, of course, you will finish the whiten teeth in the Lightroom much faster The exact mechanism of action for tooth whitening is not completely understood. Hydrogen peroxide diffuses through the organic matrix of the enamel anddentin 30-32 and then ionizes to initiate a redox chemical reaction. Hydrogen peroxide is an oxidizing agent, which breaks down to produce free radicals. Because the radicals have unpaired.

As a general dentist, I often get asked about tooth whitening and exactly how it works. There is actually no known mechanism of action but the active ingredient responsible for transforming your. The mechanism of teeth whitening includes uptake of peroxide by dental tissue and becoming lighter. Teeth getting yellow is a normal part of ageing process. However, teeth discolouration can also be caused intrinsically due to genes, fluoride, trauma, and medications. This can also happen extrinsically due to food and drinks like tea and coffee. The whitening gel used in the kit is of good quality and it's also pretty safe for your teeth. The formula ensures that you'll need to wear the tooth guard for only a few minutes per day to see results. The best part about this product is that the mouthguard is really comfortable and it also has a built-in timer Tips for caring for Hutchinson's teeth may include: Gently brush your teeth for two minutes twice a day with a soft-bristled toothbrush. Clean between your teeth once a day using floss, an interdental brush, or a flossing device. Use fluoridated items like toothpaste, mouthwash, or water (most tap water contains fluoride!) result˜in˜tooth˜discolourations˜which˜cannot˜be˜removed˜by˜simple˜brushing˜or˜professional˜ tooth˜cleaning˜and˜use˜of˜abrasives.˜For˜the˜treatment˜of˜such˜stains,˜chemical˜bleaching˜is˜ a˜conservative,˜tooth˜substance˜saving˜alternative˜to˜other˜restorative˜procedures˜such˜as

The patient's pre-bleaching shade photographs were taken and aligner trays were evaluated for fit in the mouth. A 10% carbamide peroxide bleaching material (Opalescence 10% PF) was dispensed, and the patient was instructed to apply one drop of the bleaching material per tooth in the tray every night and to wear the tray overnight Some people have white teeth, and some have yellow teeth. Teeth whitening targets the pigments on the teeth. According to the difference in the deposition location and degree of tooth staining, it can be divided into five categories: The formation of tea stains, smoke stains, which is exogenous coloring. The mechanism of this kind of. Validity: Buchalla (2006) performed a systematic review of 17 studies comparing various heat-activated mechanisms of tooth whitening. The authors completed a comprehensive search for relevant studies that included light activated whitening systems. Several of these studies included results of temperature effects in addition to efficacy Price: $24.99. The Colgate Optic White Overnight Teeth Whitening Pen is wildly popular with over 32,000 reviews on Amazon. Because it is only 3% hydrogen peroxide it is very gentle on sensitive teeth. The trade-off for the low hydrogen peroxide solution is it needs to be left on for a longer period of time

Teeth Whitening Kit with 32 LED Light, OUZIGRT Tooth Whitener with 3 Teeth Whitening Gel Pens, Professional Non Sensitive Wireless Teeth Bleaching Kit with Tray for Home and Travel Use The light mechanism is not uncomfortable although it is a bit awkward to keep it in place for the recommended length of time. My teeth seemed a shade or two. As the WebMD also says, it is unlikely that any teeth whitening product, commercial or homemade, will change the baseline color of your teeth. This is to mean that if you desire teeth that are whiter than your enamel color, a bleaching treatment from a dentist's office may be a better option Review of the mechanism of tooth whitening. J Esthet Restor Dent 2015;27(5):240-57. Patients should be aware that relapse occurs over time and can reversed with additional whitening.42 Tay LY, Kose C, Herrera DR, Reis A, Loguercio AD. Long-term efficacy of in-office and at-home bleaching: a 2-year double-blind randomized clinical trial Best for: Teeth with mild to moderate surface stains. Uses: An instant teeth whitening treatment that offers up to two shades of lift in 10 minutes. Active ingredients: Phthalimidoperoxycaproicacid (PAP) Byrdie Clean? Yes. Price: $129 About the brand: Hismile is an Australian brand founded by Nik Mirkovic and Alex Tomic.It launched with a single teeth whitening kit, and has recently expanded. How Does Whitening Toothpaste Work? Whitening toothpaste contains specific ingredients that gradually lift stains, including: Peroxide, such as hydrogen or carbamide peroxide, helps break down and remove stains.The most effective whitening products contain peroxide as an active ingredient. 1, 2 Peroxide has been proven to penetrate tooth enamel and reach the discolored molecules inside of teeth

Bleaching of nonvital teeth

LED light teeth whitening kits. These kits use LED light to activate teeth whitening agents in the product. Using a whitening solution placed within a tray, you fit the tray over your front teeth. Most products use one of the two whitening agents being either bleach-based solutions or non-bleach ones Innovative tubular design: the white tooth handle has a durable rotating mechanism and a soft brush head, which can gently fade each tooth and its dents for a complete whitening experience. The transparent tube can accurately display the remaining product quantity This is where true tooth whiteners come in. Basically, the whiteners use bleaching chemicals to get down into the tooth enamel and set off a chemical reaction (specifically, an oxidation reaction) that breaks apart the staining compounds. Most tooth whiteners use one of two chemical agents: carbamide peroxide or hydrogen peroxide (the same.

How Does Peroxide Whiten Teeth? Office for Science and

The first articles on bleaching teeth using night guard whitening bleaching were published in 1989 (Christensen, 1989a, b; Haywood and Heymann, 1989). The mechanism by which teeth are whitened by oxidizing materials such as hydrogen peroxide and carbamide peroxide are not fully understood Interest in the mechanisms of extrinsic tooth staining was rekindled in 1971 with the observation by Flotra et al., 42 that tooth staining increases with the use of chlorhexidine

dental bleaching mechanism - YouTub

The calcification of the deciduous teeth may be affected up to the age of 10-14 months, the anterior permanent teeth from 6 months to 6 years and the posterior permanent teeth up to the age of 8 years.3,8,11 Therefore, tetracycline exposure during any of these periods of calcification can result in permanent staining A Few Tips to Keep In Mind Before Using A Teeth Whitening Kit. the shade checking mechanism will give a true picture of how unique your teeth are by considering the coloration. Teeth Cleaning and Polishing Help When Utilizing a Teeth Whitening Kit. Having your teeth cleaned is a critical step in ensuring that they remain as white as you. Opalescence Teeth Whitening. With over 100 million smiles brightened and 30 years of experience, Opalescence Teeth Whitening is the global leader in professional teeth whitening. Whether you're looking for the best way to whiten your teeth at home, or if you want to whiten your teeth fast, an Opalescence Teeth Whitening kit can help you get. Tips for caring for Hutchinson's teeth may include: Gently brush your teeth for two minutes twice a day with a soft-bristled toothbrush. Clean between your teeth once a day using floss, an interdental brush, or a flossing device. Use fluoridated items like toothpaste, mouthwash, or water (most tap water contains fluoride!) Because any tooth whitening process can make your teeth sensitive, it's not advisable to whiten your teeth right before a big meeting or date, even to get the extra temporary boost of whitening.

Unfortunately, though, veneers don't respond well to at-home whitening treatments. Whitening toothpastes commonly contain abrasives like hydrogen peroxide and should be avoided. Whitening strips may be used to brighten up the surrounding teeth, but it's unlikely that the teeth will once again match the shade of your veneers In our health and beauty conscious society, men and women continually strive to recapture and maintain their youthful appearance While the exact mechanism of bleaching tooth structure has not been fully explained, the general action of bleaches involves the breaking down of unstable peroxides into highly unstable free radicals. These free radicals then react with organic pigmented molecules and through oxidation, change the ring structures to unsaturated chains which are. Most current materials use carbamide peroxide (CH 6 N 2 O 3) and hydrogen peroxide (H 2 O 2) as active ingredients for tooth bleaching regardless of in-office or at-home strategies. 24-26 Chemically, carbamide peroxide is composed of approximately 3.5 parts of H 2 O 2 and 6.5 parts of urea, so that a bleaching gel of 10% carbamide peroxide.

Zoom teeth whitening (also known as Philips Zoom WhiteSpeed) is an in-office treatment that uses 25% hydrogen peroxide to remove stains and yellowing, lightening tooth color up to eight shades. Unlike some cosmetic dentistry bleaching techniques, the procedure incorporates a blue light that the manufacturer claims activates the hydrogen. Benzoyl peroxide is a chemical compound (specifically, an organic peroxide) with structural formula (C 6 H 5 −C(=O)O−) 2, often abbreviated as (BzO) 2.In terms of its structure, the molecule can be described as two benzoyl (C 6 H 5 −C(=O)−, Bz) groups connected by a peroxide (−O−O−).It is a white granular solid with a faint odour of benzaldehyde, poorly soluble in water but. Tooth whitening mechanism: The active ingredient in tooth whitening products is typically hydrogen peroxide. Hydrogen peroxide is a strong oxidising agent which is thought to react with the dark-coloured molecules located within tooth enamel and dentine making them smaller and less-coloured and rendering the tooth 'whiter'

Americans love a white smile. And, increasingly, we're using teeth whitening treatments to get one. Teeth whitening treatments are now the No. 1 requested cosmetic dental procedure, having. Both teeth whitening with bleaching trays and Zoom whitening give similar results over a long period of time. The main difference is how long it takes. Zoom whitening can give you fantastic results in just 1-2 hours. Bleaching trays require you to be very compliant in wearing the trays if you want to get good results

Review of the Mechanism of Tooth Whitening: The Mechanism

Teeth Whitening: Definition Teeth whitening is the process of using bleach or other materials to make teeth look whiter. The materials remove stains or other discoloration from the tooth surface. Purpose Teeth whitening is a cosmetic treatment done to improve the appearance of teeth. Teeth are whitened to remove the effects of coffee,. It is the first-ever professional dental health product designed to whiten teeth without sensitivity through a mechanism of 'stain removal' and 'cleaning' rather than traditional bleaching. Dr. Zase also stated, We have furthermore found that this product has the ability to prevent teeth sensitivity associated with professional and consumer. Cavities (dental caries) are the most common oral disease that affects children from infancy through adolescence. Cavities are decayed areas on teeth that develop into tiny holes. They can form on the smooth sides of teeth, in the grooves of teeth, or on the surfaces of tooth roots. According to the 2012 National Health and Nutrition. Litero is a tooth whitening kit that uses a similar design to Primal Life Organics, in that it uses lights in a food-grade tray with a gel to help whiten your teeth. It uses the same type of charging mechanism as well, by plugging into your USB or smartphone device

Tooth whitening-induced sensitivity commonly presents itself as generalized sensitivity to cold stimuli, but can also manifest as a spontaneous sharp shooting pain on a few teeth. While some authors have regarded teeth as pressure sensitive over a very high range of pressures, the most common sensation experienced is pain Whitening strips are a type of at-home teeth bleaching product. They were first introduced in 2000 by Proctor & Gamble under the brand name Crest Whitestrips®. Since then, several companies have developed their own similar, essentially equivalent, products Using whitening trays produce an intrinsic color change. The only way to remove the extrinsic staining is to get a teeth cleaning and have the stains removed by your hygienist. So, for your tobacco habit, see your hygienist every six months (if not more) to clean your teeth and remove the stains

The Dr. Song Teeth Whitening kit uses a 35% dental-grade carbamide peroxide whitening gel that is supplied in 3 x 3mL syringes. The kit comes complete with two whitening trays and an LED accelerator light (batteries included). The trays are designed so the light slots securely into the face of the mouthpiece. Key specs KoR Whitening Deep Bleaching Review. The KöR Whitening Deep Bleaching™ System is a clinically-developed and tested teeth whitening method that claims to improve upon many of the unresolved problems of older systems, including: impermanence, failure to correct deep intrinsic staining (such as tetracycline stains) and sensitivity.. The KöR System has been developed by Dr. Rod Kurthy, a. Opalescence Endo is a specially formulated 35% hydrogen peroxide whitening gel to whiten endodontically treated, discolored teeth using the walking bleach technique. Once Opalescence Endo is delivered to the pulp chamber, it should be sealed with a temporary cement, and left in the tooth for three to five days. 35% hydrogen peroxide Tooth Whitening Options, Mechanism of Action, and Safety Considerations. By Connie Kugel, RDH, BS, and Gerard Kugel, DMD, PhD, MS Commercial Supporter: Philips Oral Healthcare. Tooth whitening is one of the most popular dental procedures, and yet it is still poorly understood. This article will review the most common tooth-whitening options Teeth Whitening Home Remedies There are said to be many home remedies for teeth whitening. In this article, we explain each teeth whitening home remedy and its effect on teeth. Some may help, but most home remedies will damage your teeth. Whiten..

Video: Teeth Whitening - Guide To a Beautiful Smile - DentalsRevie

Review of the Mechanism of Tooth Whitening - Kwon - 2015

Bleaching of teeth - SlideShar

Most kits have 2 strip sets. One set comes with the upper teeth and the second set with the lower teeth. The box also includes guidelines on how long the strips can be left on your teeth and do whitening strips work efficiently. In general, the whitening strips work out in a simple mechanism, you have to put them on an average of 2 weeks twice. 7. Deep Bleaching - MAX - $975, ULTRA - $1175, ULTRA-T - $1375. Deep Bleaching is the most effective teeth whitening system ever developed. The Max or Ultra or Ultra-T depends on the initial shade of your teeth. If you have never been able to bleach your teeth or have never been satisfied with the results, this is your answer The teeth whitening pen contains 3% hydrogen peroxide and is a vegan, gluten free and sugar free teeth stain remover; Includes: (1) teeth whitening pen, (1) overnight stand to store; 35 nightly treatments in 1 pen; The tooth whitening serum forms a film on the tooth surface overnight. Brush teeth in the morning to remov Bleaching And Whitening Agents - Aaradhya Dental Care is the best clinic for tooth pain treatment in Indore. Dr. Jyoti Chipde is director of Aaradhya Dental Care. She provides world class treatment for Sports Dentistry, Bridal Dentistry, Dental Implant Fixing, Cosmetic Dentistry, Gum Disease Treatment / Surgery, Discolored Tooth Restoration, and Crowns and Bridges Fixing etc. Book an.

5. Kwon SR, Wertz PW. Review of the mechanism of tooth whitening. J Esthet Restor Dent. 2015;27 (5):240-257. 6. Ontiveros JC, Paravina RD. Color change of vital teeth exposed to bleaching performed with and without supplementary light. J Dent. 2009;37 (11):840-847. 7

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