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Teeth whitening is generally safe for healthy adult teeth and gums when the product is used as directed. The side effects are well known, tooth sensitivity and gum irritation, and they are usually temporary.
Key takeaways
- Main side effect: temporary sensitivity. The American Dental Association says it can affect up to two-thirds of people who whiten.
- Enamel: whitening gel doesn’t strip enamel away. Overuse and uncontrolled products are where the risk lies.
- Not for everyone: whitening isn’t advised during pregnancy or breastfeeding, under 18, with braces, or on unhealthy teeth and gums.
- Who we are: The Smile Bar is a teeth whitening studio in Bangkok, not a dental clinic. This guide tells you when a dentist is the better choice.
Is teeth whitening safe? The short answer
Yes, in most cases, on three conditions:
- Healthy teeth and gums. No untreated cavities, no gum disease.
- A suitable product, from a manufacturer you can identify.
- Limited exposure. The time on the teeth and the number of sessions follow the instructions.
What the main health bodies say:
- The American Dental Association lists temporary tooth sensitivity and gum irritation as the side effects of whitening.
- The UK’s National Health Service advises against it during pregnancy and breastfeeding, under 18, and on unhealthy teeth or gums.
- A Cochrane review of 71 trials of home whitening found the most common unwanted effects were tooth sensitivity and irritation of the mouth.
Teeth whitening side effects: how common, how long, what to do
| Side effect | How common | How long it lasts | What to do |
|---|---|---|---|
| Tooth sensitivity | Up to two-thirds of people, mild to moderate (ADA) | Usually gone within a few days | Avoid very hot and very cold drinks. Use a toothpaste for sensitive teeth |
| Gum irritation | Possible where gel touches the gum | Usually short-lived (ADA) | Rinse with water. Leave the area alone |
| White patches on the gums | Listed by the NHS | Temporary | Tell your provider. See a dentist if it doesn’t fade |
| Uneven colour | Expected if you have crowns, veneers or fillings | Lasting: these materials don’t whiten | Ask a dentist before you whiten |
The ADA figures come from studies of strips and trays used at home. They aren’t figures measured at The Smile Bar. For more detail, read does teeth whitening hurt?
When to see a dentist
- The pain is strong, or it wakes you at night.
- Sensitivity lasts more than a few days.
- A sore area on the gum doesn’t heal.
Does teeth whitening damage enamel?
Whitening gel doesn’t remove enamel. The peroxide passes through it and breaks down the pigments underneath.
The picture isn’t completely clean, though. The ADA notes that bleaching may change the surface roughness of enamel. Most studies showing changes were done on teeth in a laboratory, not in the mouth, as a dentist at the Cleveland Clinic points out.
| What raises the risk | What limits it |
|---|---|
| Whitening more often than directed | Following the stated time and frequency |
| Products with no identifiable maker | A product whose manufacturer is named |
| Home remedies: lemon, charcoal, scrubbing with baking soda | No acidic or abrasive “hacks” |
| Whitening on worn enamel or exposed roots | A dental check-up first if you have doubts |
More on the active ingredient in hydrogen peroxide for teeth whitening.
A whitening session at The Smile Bar: gel and a UV-free LED lamp, 20 minutes at a time.
Who should not whiten their teeth?
| Situation | Why | What to do | At The Smile Bar |
|---|---|---|---|
| Pregnant or breastfeeding | Not well studied | Wait | We don’t whiten |
| Under 18 | Not recommended by the NHS | Wait | We don’t whiten |
| Wearing braces | Gel can’t reach under the brackets | Whiten after the braces come off | We don’t whiten |
| Cavities or gum disease | Gel can irritate damaged teeth and gums | Get treated first | See a dentist first |
| Worn enamel, exposed roots | Higher risk of sensitivity | Ask a dentist | See a dentist first |
| Crowns, veneers, visible fillings | Only natural teeth whiten | Ask a dentist about matching the colour | Possible, with uneven results |
| Grey or internal stains | Surface whitening has little effect | A dentist has other options | See a dentist |
Pregnancy and breastfeeding
The ingredients in whitening products haven’t been well studied in pregnancy or breastfeeding, as MotherToBaby explains. The NHS advises against it. Waiting is the cautious choice, and it’s our rule.
Braces, crowns, veneers and fillings
Whitening changes the colour of natural teeth only. If you have a crown or a filling on a front tooth, it may look darker than the teeth around it afterwards.
Under 18
The NHS says whitening isn’t done at 17 or younger. The American Academy of Pediatric Dentistry discourages cosmetic whitening for children who still have baby teeth.
Is LED teeth whitening safe?
- The gel does the whitening. The lamp is used together with it.
- LED light is UV-free, so there’s no ultraviolet exposure for your lips or gums.
- Light doesn’t add risk-free power. Studies haven’t shown that a lamp improves the result, and the ADA lists the intensity and duration of light among the factors in sensitivity.
How it works in practice: cool light (LED) teeth whitening.
Is it safe to get your teeth whitened in Thailand?
It depends on who does it and with what. In Bangkok you’ll find three kinds of provider.
| Provider | What it offers | Best for |
|---|---|---|
| Dental clinic | A dentist examines your mouth and uses stronger gels reserved for dental practitioners | Dental problems, crowns or veneers, internal stains |
| Whitening studio | Cosmetic whitening only, with a milder gel. No diagnosis, no dental treatment | Healthy teeth with everyday stains |
| Beauty salon | Whitening alongside other beauty services | Check the product and the hygiene carefully |
In Thailand and across Southeast Asia, stronger whitening products are reserved for dental practitioners. Products used outside dental clinics are milder.
Whitening studio or dental clinic: what’s the difference?
Rules differ from country to country. In the UK, for example, only registered dental professionals may whiten teeth, and the NHS advises going to a dentist. If you come from the UK or Australia, a whitening studio may be new to you.
The Smile Bar is a whitening studio, not a dental clinic.
What we do
- Cosmetic LED whitening, and nothing else.
- Name our product and its maker.
- Turn people away when whitening isn’t suitable.
What we don’t do
- Diagnose or treat cavities, gum disease or tooth pain.
- Whiten from inside a tooth, or treat grey and internal stains.
- Fit or replace crowns, veneers and fillings.
Choose a dentist if you have pain, a cavity, gum problems, visible crowns, or if you haven’t had a check-up for a long time.
How to judge a whitening provider in Bangkok: a checklist
| Good signs | Warning signs |
|---|---|
| They ask about your teeth, pregnancy and dental work before starting | No questions asked |
| The product and its manufacturer are named | An unlabelled gel |
| The lamp is UV-free | They can’t say what the lamp is |
| Single-use items, clean equipment | Reused trays or tips |
| They refuse some clients | They accept everyone |
| Prices are published | A price far below the market, or a guaranteed shade |
| Clear advice for afterwards | No aftercare advice |
If you’re visiting Thailand
- Dental work planned on the same trip? Have it first, and ask your dentist when to whiten.
- Whiten early in your stay rather than the day before you fly, so you can go back with any question.
- Still sensitive after you’re home? See your own dentist.
How we handle safety at The Smile Bar
- One service: teeth whitening.
- The gel: Brilliant Smile, made in Sweden. Low-concentration, pH-neutral and water-based. More in teeth whitening gel explained.
- The lamp: UV-free LED.
- The time: 20 minutes per session, up to three sessions in one visit.
- Who we turn away: women who are pregnant or breastfeeding, people who wear braces, anyone under 18.
- Afterwards: every package includes a whitening toothpaste and mouthwash, and advice for the first 72 hours.
The Smile Bar studio in Siam Square, Bangkok.
Book your whitening session in Bangkok
- Single Whitening: 1 × 20 minutes, 2,399 THB
- Double Whitening: 2 × 20 minutes, 4,399 THB
- Triple Whitening: 3 × 20 minutes, 5,799 THB
Results range from 2 to 9 shades lighter, 5 on average. Book online or walk in when a chair is free. We’re on the ground floor at 392/27-28 Siam Square Soi 5, next to BTS Siam, open every day from 10 am to 8 pm. All prices are on our teeth whitening prices page.
Frequently asked questions
Is teeth whitening bad for your teeth?
Not for healthy teeth when the product is used as directed. The usual side effects are temporary sensitivity and gum irritation.
Does teeth whitening permanently damage enamel?
Whitening gel doesn’t strip enamel away. It can change the enamel surface slightly, and overuse raises the risk, so stick to the stated time and frequency.
How long do teeth whitening side effects last?
Usually a few days. The American Dental Association notes that sensitivity generally settles within days of stopping. See a dentist if it lasts longer.
Is teeth whitening safe during pregnancy or breastfeeding?
It hasn’t been well studied, so the NHS advises against it. We don’t whiten teeth for women who are pregnant or breastfeeding.
Can I whiten my teeth with braces, crowns, veneers or fillings?
Not with braces. Crowns, veneers and fillings don’t change colour, so they may stand out afterwards. Ask a dentist first.
Is it safe to have my teeth whitened by someone who is not a dentist?
Rules differ by country, and a dentist is the right choice if you have any dental problem. A whitening studio suits healthy teeth with everyday stains. Use the checklist above to judge any provider.
How often is it safe to whiten your teeth?
There’s no official interval. Wait until any sensitivity has gone. More in how long teeth whitening lasts.
Is teeth whitening safe for sensitive teeth?
Often yes, but sensitivity may increase for a few days. See does teeth whitening hurt?
