DENTAL · COSMETIC
Teeth Whitening
Also known as: tooth bleaching · teeth bleaching
Teeth whitening lightens the color of your natural teeth with a bleaching gel. A dentist can do it in the clinic in one appointment, or give you custom trays to use at home.
- Session timeAbout 1 to 2 hours
- Visits1
- Time abroadOne appointment
- Results lastUp to about 3 years
Is Teeth Whitening Safe?
It can be, when a dentist does it or supervises it. Before whitening, your dentist checks that your teeth and gums are healthy. The NHS says whitening kits from salons, pharmacies or online may not work as well and may harm your teeth and gums. Rules on who can whiten teeth, and how strong the gel can be, differ from country to country.
Possible Side Effects
These effects usually last a short time, often a few days.
- Teeth that are sensitive to cold, or to sweet food and drink
- Sore gums or a sore throat
- White patches on the gums
What to Keep in Mind
- Whitening with trays at home usually causes less sensitivity than whitening in the clinic.
- Tell your dentist about any crowns, veneers or fillings on the teeth you want to lighten.
- Regular checkups help you keep your teeth and gums healthy before and after whitening.
Who Is a Good Candidate for Teeth Whitening?
Teeth whitening may suit you if your teeth and gums are healthy and your natural teeth have become darker or more yellow. You may be a good candidate if:
Good Candidates
Your teeth and gums are healthy. Gum disease and cavities are treated before whitening.
You're over 17. Whitening isn't done for people aged 17 or under.
You're not pregnant or breastfeeding. Whitening isn't recommended during pregnancy or breastfeeding.
The teeth you want to lighten are natural. Crowns, veneers, fillings, dentures and implants don't change color.
Your dentist makes the final decision after examining your teeth and gums.
Types of Teeth Whitening: In-Office, Take-Home and Over the Counter
Your dentist recommends a type based on your teeth, how much lighter you'd like them and how quickly.
In-Office Whitening
- How it works
- Your dentist protects your gums, then applies a stronger peroxide gel than the products you can buy.
- Often used for
- Results in one appointment
- What to expect
- About 1 to 2 hours in the chair, and you may see a change after one session.
Take-Home Whitening with Trays
- How it works
- Your dentist makes trays that fit your teeth and gives you a gel to use in them, for a set time each day or overnight.
- Often used for
- Whitening at home, on its own or after an in-office session
- What to expect
- Usually 1 to 2 weeks, and up to 6 weeks for some people. It tends to cause less sensitivity than in-office whitening.
Over-the-Counter Products
- How it works
- Strips, gels and toothpastes with weaker ingredients than a dentist uses.
- Often used for
- Light surface stains
- What to expect
- They may remove some surface stains, but usually don't change the color of your teeth much.
How Is Teeth Whitening Done? Procedure Steps
In-office whitening is usually done in one appointment of about 1 to 2 hours.
Checking Your Teeth and Gums
StartYour dentist checks that your teeth and gums are healthy. Gum disease and cavities are treated first.
Protecting Your Gums
StartYour gums are covered to protect them from the gel.
Whitening
Main partYour dentist applies the whitening gel to your teeth. Some clinics also use a light, though studies haven't shown that it improves the result.
Trays for Home, If Planned
EndIf your plan includes take-home whitening, your dentist gives you trays that fit your teeth and the gel to use in them.
After Teeth Whitening: Sensitivity and Care
Some people's teeth feel sensitive for a few days after whitening. It's usually short-term.
THE FIRST DAYS
Sensitivity
You may notice it with cold, or with sweet food and drink.
Gums
They may feel sore for a few days.
KEEPING YOUR RESULT
Keeping your result
Brush your teeth well and have regular cleanings. Seeing your dentist once or twice a year helps manage surface stains.
Touch-ups
In one study, people who used a home touch-up product each month after in-office whitening kept their shade better over 6 months.
How Long Should You Stay Abroad for Teeth Whitening?
In-office whitening is usually done in one appointment, so it can fit into a short trip. If your plan includes trays, you continue at home.
1appointment
for in-office whitening.
1 to 2hours
in the chair.
A Typical Plan
ARRIVAL
Arrive
Transfer to your hotel.
APPOINTMENT
Whitening
Checking your teeth and gums, then whitening in about 1 to 2 hours.
BEFORE YOU FLY
Notes and trays
Your written treatment notes and, if your plan includes them, your trays and gel for home.
Flight times and entry rules depend on the country you choose. See the travel notes for each country in the comparison above, and check the entry requirements for your passport before you book.
Back Home: Follow-Up
Before you leave, ask for your treatment notes in writing, including the type of whitening and any home treatment.
How to Choose a Teeth Whitening Clinic
Choose the dentist first, then the clinic. Look for a licensed dentist who checks your teeth and gums before whitening, explains which teeth will lighten, and gives you a written plan before you pay.
What to Check
- The clinic's license from the national health authority
- A licensed dentist who examines you and does or supervises your whitening
- A written plan: in-office, trays at home, or both, and how many sessions
- A clear note on any crowns, veneers or fillings that won't change color
- Everything the price includes
Questions to Ask Your Coordinator
- Will whitening work on my teeth?
- Will my crowns, veneers or fillings still match afterwards?
- Do you suggest in-office whitening, trays at home, or both?
- How will follow-up work once I'm home?
- Has this clinic been verified, and when?
Teeth Whitening: Frequently Asked Questions
Does teeth whitening hurt?
It can cause some sensitivity, especially to cold, during or after treatment. This is common and usually goes away quickly.
Can I whiten crowns or veneers?
No. Whitening only lightens natural teeth. If you have crowns, veneers or fillings on your front teeth, ask your dentist how they'll match after whitening.
Will my teeth be whiter after one session?
You may see a change after one in-office session, but whitening is a gradual process. How much lighter your teeth get depends on each tooth.
Our Sources
Teeth whitening
NHS, 2025 · nhs.uk
Tooth whitening
Oral Health Foundation, 2026 · dentalhealth.org
Are Teeth Whiteners Safe and Worth Trying?
Cleveland Clinic, 2024 · health.clevelandclinic.org
Cosmetic Dentistry: Purpose, Procedures & Benefits
Cleveland Clinic, 2024 · my.clevelandclinic.org
Teeth Whitening
American Dental Association, MouthHealthy · mouthhealthy.org
Tooth Whitening: What We Now Know
Journal of Evidence-Based Dental Practice, 2014 · pmc.ncbi.nlm.nih.gov
Do Laser and Light Activation Improve In-Office Dental Bleaching Outcomes? An Umbrella Review
Journal of Esthetic and Restorative Dentistry, 2026 · pmc.ncbi.nlm.nih.gov