Cosmetic dentistry

Teeth Whitening

Professional teeth whitening lightens the natural colour of your teeth with a peroxide gel, applied by a dentist in the clinic or worn at home in custom trays your dentist supplies. It suits adults with healthy teeth and gums whose teeth are stained or have darkened. It does not change crowns, veneers or fillings. At Vita Smile, in-clinic whitening is laser whitening.

Published by Vita Smile Dental Clinic Sources (6)

A dental shade guide used to match tooth colour

Key takeaways

  • Whitening lightens natural teeth only: crowns, veneers, fillings, dentures and implants keep their colour [1][2].
  • The gel contains hydrogen or carbamide peroxide, which breaks stains into smaller pieces so the colour looks less concentrated [2].
  • Side effects such as tooth sensitivity and gum irritation are usually temporary [1][3].
  • In the UK, cosmetic whitening products may not contain more than 6% hydrogen peroxide; above 0.1%, they are supplied only through dental professionals and not used on under-18s [4].
  • In-clinic whitening and home trays can both give good results under a dentist's supervision [3], with similar shade-guide results in trials [5].

At a glance

Active ingredient
Hydrogen or carbamide peroxide
In our clinic
Laser whitening, usually one visit
Home trays
A few days to a few weeks
Minimum age
18
Does not whiten
Crowns, veneers, fillings
Results can last
Around 3 years
Session time
1–2 hours

Clinically reviewed by

Dr. Hediye Nur Uygun

General Dentistry

Last reviewed
Sources 6 sources cited

The basics

How does professional teeth whitening work?

Teeth darken for different reasons. Coffee, tea, red wine and tobacco leave stains on the enamel surface. With age, the enamel gets thinner and more of the yellowish dentin underneath shows through. An injury or certain medicines can change a tooth's colour from the inside [2].

Professional whitening gels contain one of two bleaches, hydrogen peroxide or carbamide peroxide. They break stains into smaller pieces, which makes the colour less concentrated and the teeth look brighter [2]. Whitening toothpaste works differently: it polishes away surface stain but does not change the colour of the tooth itself [2].

How well whitening works depends on the stain. Yellow teeth usually respond well, brown teeth may respond less, and grey teeth may not lighten at all [2]. It may also not work when the discolouration comes from medicines or a tooth injury [2]. In those cases, composite bonding or dental veneers can cover the colour instead. Whatever the cause, a dentist should check that your teeth and gums are healthy before any whitening [1][3].

Is it right for you?

Who is teeth whitening for?

Professional whitening suits adults with healthy teeth and gums whose natural teeth have become stained or darker, for example from coffee, tea, red wine, smoking or age [1]. It is not done for anyone under 18 or on unhealthy teeth or gums, and it is not recommended during pregnancy or breastfeeding [1].

Whitening is a good fit if

  • Your natural teeth are stained or have darkened with age [1]
  • Your teeth look yellowish rather than grey [2]
  • Your teeth and gums are healthy, or have been treated first [1]
  • You plan veneers or crowns and want your natural teeth lighter before the shade is chosen

Ask us about alternatives if

  • Your front teeth have crowns, veneers or large fillings: they keep their colour, so they may stand out after whitening [1][2]
  • Your discolouration comes from medicines or an injury: whitening may not work [2]
  • You have decay or gum problems: they are treated first, and gum treatment may come before whitening [1]
  • Your teeth are already sensitive: tell your dentist before you start

Step by step

How teeth whitening works, step by step

Whatever the method, professional whitening starts with a dental check and is supervised by a dentist [1][4].

  1. Before you travel

    Online consultation

    Send a few photos of your smile. A dentist reviews them and replies with personalised advice and a written quote.

  2. Step 1

    Examination

    A dentist checks your teeth and gums to make sure whitening is right for you [1]. Decay or gum problems are treated first.

  3. Step 2

    Protecting the gums

    In the clinic, a protective gel or rubber shield covers your gums [2]. For home whitening, trays are made to fit closely around your teeth [1].

  4. Step 3

    Whitening

    In the clinic, the gel is applied to your teeth, usually in one visit [2]. At home, you wear the gel in the trays as instructed, over a few days to a few weeks [2].

  5. At home

    Aftercare

    Brush well and keep up regular dental cleaning. Smoking, tea, coffee and red wine bring stains back sooner [3].

Timelines vary with the method, the product and your teeth; your dentist confirms them after examining you.

Find out if whitening will work for your teeth

Send a few photos of your smile. A dentist reviews them and replies with personalised advice and a written quote, free of charge.

Book a free online consultation Ask on WhatsApp

Compare your options

In-clinic whitening vs home trays vs shop-bought products

Both professional methods can give good results under a dentist's supervision [3]. A review of 32 studies found no difference in shade change on shade guides, and less intense sensitivity on average with home trays, on low-quality evidence [5]. Shop-bought products contain much less whitening agent [2][3].

In the clinic Home trays from a dentist Shop-bought products
Supervised by a dentist Yes Yes, usually with a fitting appointment No
Treatment time Usually one visit A few days to a few weeks Varies by product
Strength of the gel Professional strength Professional strength Lower
Colour change Similar on shade guides in trials Similar on shade guides in trials Usually small

Methods and timing: NHS [1], ADA [2], Oral Health Foundation [3]. Trial evidence: a systematic review of 32 studies [5]. In a review of 21 trials, adding a light to in-clinic gel did not seem to improve the colour change [6].

Before you decide

Risks and side effects of teeth whitening

Professional whitening uses strong chemicals [1]. Side effects can happen, but they are usually short-lived [3]:

  • Sensitivity: teeth can become sensitive to cold or sweet food and drink [1]. Peroxide can pass through the enamel to the dentin and irritate the nerve; in most cases the sensitivity is temporary [2].
  • Gum irritation: sore gums or throat, or white patches on the gums, can appear for a short time even with a gum shield [1].
  • Uneven results with restorations: crowns, veneers, fillings, dentures and implants keep their colour, so they can look darker next to whitened teeth [1][2].
  • Overuse: using whiteners too often or for too long can damage the enamel or gums, so follow your dentist's instructions [2].
  • Peroxide strength is regulated: in the UK, under rules based on EU law (Directive 2011/84/EU), cosmetic whitening products may not contain or release more than 6% hydrogen peroxide. Products with 0.1% to 6% are supplied only through a dental professional, after an examination, and not to under-18s [4].

Whitening does not last forever. If you follow your dentist's advice, the effect may last around 3 years [1]; smoking and drinks such as tea, coffee and red wine bring staining back sooner [3].

  • 6%

    maximum hydrogen peroxide in cosmetic whitening products in the UK [4]

  • 18

    minimum age for professional-strength whitening products [4]

  • Around 3 years

    how long results may last with your dentist's advice [1]

Dr. Hediye Nur Uygun

From our dentist

“The first thing I want to know is why the teeth have darkened. Surface stains from coffee or tea usually respond well; a grey tooth or a stain from an old injury may not, and you should hear that at the start. Fillings, crowns and veneers at the front will not change colour either, so I check them before we begin. If your teeth are already sensitive, we adjust the plan first. Whitening should make your teeth look like your own, only brighter.”

Dr. Hediye Nur Uygun · General Dentistry

Treatment abroad

Choosing a clinic for teeth whitening in Istanbul

Whitening is dental treatment: wherever you have it, a dental professional should examine you first and supervise it [1][4].

Before you book, ask:

  • Who will examine me and supervise the whitening?
  • Which method do you recommend for my teeth, in the clinic or with home trays, and why?
  • Which whitening product is used, and how strong is it?
  • Do you use a light or laser, and what does it add?
  • Will my crowns, veneers or fillings still match afterwards, and what are my options if they do not?

If old crowns or veneers on several front teeth no longer match, a Hollywood smile plan may suit you better than whitening alone. This page is reviewed by Dr. Hediye Nur Uygun, a general dentist; ask us anything in a free online consultation.

Questions

Teeth whitening: frequently asked questions

Can't find your answer? Our coordinators are happy to help on WhatsApp.

Ask on WhatsApp
How much should I expect to pay for teeth whitening in Istanbul?

The cost depends on the method (in the clinic, home trays or both) and on whether your teeth need cleaning or other treatment first. After a free online assessment you receive personalised advice and a written quote, so you know the expected cost before you travel. The quote is confirmed after your examination at the clinic.

Is Istanbul a good place to get your teeth whitened?

It can be, if the clinic is licensed, a dentist examines your teeth and gums first and a dental professional supervises the whitening [1][4]. Ask which method and product are used, and what to do if your teeth become sensitive at home.

Can yellow teeth really be whitened?

Often, yes. Yellow teeth usually respond well, brown teeth may respond less, and grey teeth may not lighten at all [2]. A dentist can tell you what to expect after an examination.

Which country should I choose for teeth whitening?

No country stands out on its own. What matters is that a dental professional examines you and supervises the treatment [4]. Whitening done in beauty salons or with kits bought online is less effective and can damage teeth and gums [1].

How long does teeth whitening last?

With your dentist's advice, the effect may last around 3 years, though results vary [1][3]. Good brushing and regular dental cleaning help keep the result [3].

Is laser teeth whitening better?

In-clinic whitening at Vita Smile uses a laser to activate the gel. The NHS describes laser whitening at a dental surgery as quicker and more effective than gel alone [1]. However, a systematic review of 21 randomised trials found that adding a light did not seem to improve the colour change or affect sensitivity [6]. The peroxide gel does the whitening; your dentist explains what to expect for your teeth.

Can veneers or crowns be whitened?

No. Whitening only lightens natural teeth; veneers, crowns and fillings keep their colour [1][2]. If you plan veneers, whiten your natural teeth first so the new shade can be matched to them.

What our patients say

Read what our patients say about us on Google and Trustpilot.

Patient reviews from Google and Trustpilot

Rated 5 out of 5 Trustpilot — Trustpilot review

I visited Vita Smile Dental Clinic for implants and a smile makeover, and I couldn’t be happier with the outcome. Dr. Vildan and her team were warm, knowledgeable, and extremely detail-oriented. The clinic itself is spotless and modern, and they made sure I was comfortable every step of the way. They even helped with transportation and accommodation, which made the whole experience stress-free. My new smile looks amazing — I feel more confident than ever. If you're thinking about dental treatment in Turkey, Vita Smile is a fantastic choice. Thank you for everything!

Fuat D. August 2025
Rated 5 out of 5 Google — Google review

First of all, the dentist is very reliable and professional. The clinic has a very friendly atmosphere, and both the service and approach to patients are of the highest standard – everything is handled professionally. The dentist is extremely professional and gentle in her work. She always asks if anything hurts and makes sure the patient feels comfortable during every visit. Special recognition also goes to the consultant Rafia, who always responds quickly to any questions or concerns. She is very helpful, kind, and always tries to find a solution and speak with patients with care and understanding. The clinic is very clean, and every patient is treated individually and with full attention. I wholeheartedly recommend this dental clinic.

Elwira K.
Rated 5 out of 5 Trustpilot — Trustpilot review

We were in a medical trip to Turkey, headed to Vita Smile. Everything went smooth -from airport to clinic and back home-. The procedure was seamless, as for me I regained trusts in myself now that I can smile again. Also lots of thanks to ms.Oana for everything.

Stephen Romania · April 2025
Rated 5 out of 5 Google — Google review

The team and doctors are very professional, I am very pleased to have had my teeth whitened and cleaned, I recommend it to everyone. Thank you

Rumeysa Y.
Rated 5 out of 5 Trustpilot — Trustpilot review

I visited Vita smile for my tooth pain. Dr Vildan and all team was so helpfull. They gave me teeth cleaning for free as a present. I suggest it to all my friends. Thanks for all.

Mehmet F. August 2025
Rated 5 out of 5 Trustpilot — Trustpilot review

Diş için geldim. Diş ile ilgili bütün sorunlarimi hallettiler ve çok güzel oldu çok ilgililer.

Oğuzhan F. August 2025
Rated 5 out of 5 Trustpilot — Trustpilot review

yeni zirkonyum yaptırdım çok memnun kaldım, hekimin eli çok hafifti gerçekten. gülümsemek 🤩

June 2025
Rated 5 out of 5 Trustpilot — Trustpilot review

Temiz ve rahat bir ortamda operasyon um yapildi.Doktorlara ilgilerinden dolayı teşekkür ederim. Yapılan işlemler beni çok mutlu ve özgüvenli hissettirdi. Tüm ekibe TESEKKUR ederim.

Ulas K. March 2025
Rated 5 out of 5 Trustpilot — Trustpilot review

Almanya'daki bir tanıdığımız vaasitasi ile alakalı geldim 1 hafta içerisinde full ağız implant ve lamine tedavilerini yaptirdim doktor ekip tamamı ile kusursuz kesinlikle tavsiye ediyorum

Volkan S. March 2025
Rated 5 out of 5 Google — Google review

Daha önce olan diş kaplamalarım inanınlmaz rahatsız ediyordu zirkonyum kaplama için arkadaşımın tavsiyesiyle gittim 3-4 gün gibi bir sürede eski kaplamalar sökülüp yeni ölçüler alındı provalar yapıldı ve yeni kaplamalar yapıldı çok doğal ve çok kullanımı rahat hiçbir sıkıntı yaşamadım tüm ekibe teşekür ederim.

Mine A.
Rated 5 out of 5 Google — Google review

"Gülüşümü tamamen değiştirdiler! Zirkonyum kaplamalarım o kadar doğal duruyor ki, kimse kaplama olduğunu anlamıyor. Renk uyumu ve diş etleriyle olan uyumu tek kelimeyle mükemmel. Estetik kaygısı olan herkese gözü kapalı öneririm."

Ali A.
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Sources

Studies and patient guides this page is based on.

  1. [1] Teeth whitening — NHS (page last reviewed 19 August 2025) · nhs.uk
  2. [2] Teeth Whitening — MouthHealthy, American Dental Association · mouthhealthy.org
  3. [3] Tooth whitening — Oral Health Foundation (updated April 2026) · dentalhealth.org
  4. [4] Tooth whitening position statement — General Dental Council, 2016 · gdc-uk.org
  5. [5] de Geus JL, Martins A, Reis A, Rezende M. At-home vs In-office Bleaching: An Updated Systematic Review and Meta-analysis. Operative Dentistry, 2025 · doi.org
  6. [6] Maran BM, Burey A, de Paris Matos T, Loguercio AD, Reis A. In-office dental bleaching with light vs. without light: A systematic review and meta-analysis. Journal of Dentistry, 2018 · doi.org