Cosmetic and orthodontic guide
5 min readTeeth whitening
Teeth whitening should follow professional assessment and legal UK requirements. Suitability, sensitivity and uneven results should be discussed first.
Teeth whitening is a cosmetic dental treatment that changes the shade of natural teeth. Fillings, crowns, veneers and some stains may not respond in the same way.
UK tooth whitening has legal and professional restrictions. Ask a dentist about suitability, risks and alternatives before starting treatment.
At a glance
Check suitability
Assessment first
- A dental assessment can check teeth, gums and existing restorations.
- Whitening may cause sensitivity or uneven results.
- Crowns, veneers and fillings do not whiten like natural tooth tissue.
Know the rules
UK law
- The GDC states that tooth whitening is the practice of dentistry.
- Products and providers must follow UK legal requirements.
- Young people and pregnancy require careful professional discussion before treatment.
Stop and ask
Symptoms
- Seek advice if sensitivity is severe or does not settle.
- Gum burns, pain or swelling should be assessed.
- Do not continue a product that is causing harm.
Contents
What teeth whitening can and cannot do
Whitening changes the shade of natural teeth but does not repair decay, cracks, gum problems or restorations. Results vary by tooth colour, staining, restorations and treatment method.
Possible causes or contributing factors
- Natural tooth shade or external staining.
- Existing fillings, crowns or veneers that will not change shade.
- Sensitivity, gum irritation or suitability concerns.
What you can do now
- Ask for a dental assessment before whitening.
- Discuss sensitivity, restorations and likely limitations.
- Check that treatment is provided within UK legal requirements.
What not to do
- Do not buy or use illegal whitening products.
- Do not expect restorations to whiten like natural teeth.
- Do not continue whitening if it causes significant pain or gum injury.
When to contact a dentist
- You are considering whitening and have fillings, crowns, veneers or sensitivity.
- You are unsure whether a provider or product is appropriate.
- Whitening causes pain, gum irritation or uneven results.
When prompt advice is needed
- Pain, swelling, burns or severe sensitivity develops.
- A whitening product has caused injury or worrying symptoms.
- A dental problem is noticed before or during whitening.
What a dentist or relevant professional may assess or do
- Assess oral health and suitability for whitening.
- Discuss legal treatment options, limitations and sensitivity risk.
- Advise on restorations that may not match after whitening.
Frequently asked questions
Is teeth whitening suitable for every patient?
No. Suitability depends on oral health, restorations, sensitivity, age, pregnancy considerations and professional assessment.
Will crowns and fillings whiten?
No. Restorations do not usually change shade like natural teeth, so colour mismatch can occur.
Who can provide tooth whitening?
The GDC states tooth whitening is the practice of dentistry. Ask a registered dental professional about legal treatment options.
Considering teeth whitening?
Read balanced guidance and discuss suitability, sensitivity and limitations with a dental professional before treatment.
View teeth whitening informationOfficial sources
These links open external official guidance pages for further help.
Content reviewed by Dr Majid Saeed · 13 July 2026
References used for this guide are listed above.
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