Tooth sensitivity is the most common side effect of teeth whitening. It is usually mild and short-lived, and there are simple ways to reduce it. If you already have sensitive teeth, whitening can often still be done with some changes to the approach.
Key points
- Sensitivity is the most common side effect of whitening and usually settles within 24–48 hours.
- It happens because peroxide temporarily makes the tooth nerve more reactive.
- Sensitive-teeth toothpaste, fluoride and shorter wear times help reduce it.
- People with sensitive teeth can often still whiten after a check-up.
Why does whitening make teeth sensitive?
Whitening gels use hydrogen peroxide or carbamide peroxide to break down stains inside the enamel. The peroxide passes through the enamel into the layer underneath (dentine), which contains tiny fluid-filled tubes connected to the nerve. For a short time this makes the nerve more reactive to cold, air and touch.
How long does sensitivity after whitening last?
For most people, sensitivity after teeth whitening settles within 24 to 48 hours of finishing a session. With take-home trays it can come and go during the treatment period. Sensitivity lasting more than a few days, or pain in one tooth, should be checked by a dentist, as it may be a crack, decay or a leaking filling rather than the whitening.
How to reduce sensitivity after whitening
- Brush with a toothpaste for sensitive teeth for two weeks before and during whitening
- Use a fluoride gel or mousse if your dentist recommends one
- Wear take-home trays for shorter periods, or skip a day between sessions
- Avoid very cold or very hot food and drinks for 24 hours
- Don’t use more gel than directed
Teeth whitening for sensitive teeth: is it possible?
Often, yes. Your dentist will first look for the cause of the sensitivity, such as gum recession, worn enamel or a cracked tooth, and treat it before whitening. Options include a lower-strength gel, shorter wear times, and a desensitising agent before and after treatment. Supermarket kits aren’t fitted to your teeth, so gel can sit on the gums and cause irritation. Read more about what causes tooth sensitivity.
Who shouldn’t whiten?
Whitening isn’t suitable if you have untreated decay or gum disease, or if you are pregnant or breastfeeding. It won’t change the colour of crowns, veneers or fillings.
Teeth whitening in Penrith
Penrith Dental Care offers in-chair and take-home teeth whitening in Penrith after a check-up. We check for causes of sensitivity first and adjust treatment to suit you. Results vary between individuals. Call (02) 4733 1197 to book.
Frequently asked questions
Is sensitivity after whitening long-term?
No. It is temporary and usually settles within a day or two.
Does whitening damage enamel?
Professional whitening used as directed isn’t known to damage enamel. Overusing whitening products can irritate teeth and gums.
Can I take pain relief for whitening sensitivity?
Over-the-counter pain relief taken as directed on the pack can help. Ask your dentist or pharmacist if you’re unsure.
This article is general information only and doesn’t replace an examination by a registered dental practitioner.