You whitened your teeth and now they ache. Tooth sensitivity after whitening is extremely common — and usually temporary. Here's why it happens, how long it lasts, and what actually helps.
Whitening products use peroxide-based agents to lift stains from your teeth. Hydrogen peroxide or carbamide peroxide penetrates the enamel and reaches the dentine layer underneath. This can temporarily stimulate the nerves inside your teeth, causing that sharp, tingly sensation when you sip a cold drink or bite into something sweet.
Why does this happen to you?
Not everyone experiences sensitivity after whitening. It depends on the strength of the product, how long it stays on your teeth, and whether your enamel is naturally thinner or more porous. If you already have sensitive teeth or gum recession, you're more likely to feel it. The good news is that the sensitivity is not damaging your teeth — it's a temporary reaction, not permanent damage.
How long does it last?
For most people, sensitivity peaks within the first 24 to 48 hours after treatment and then fades. In rare cases, it can linger for a week or two. If it persists beyond that, it's worth contacting your dentist to rule out any underlying issues.
What actually helps
Use a desensitising toothpaste — these contain compounds that block the tiny tubes in your dentine. Avoid very hot or very cold foods and drinks for a few days. Space out whitening sessions rather than repeating them too frequently. Your dentist may also recommend a fluoride gel or remineralising product to strengthen your enamel between sessions.
Preventing sensitivity next time
Consider a lower-concentration whitening product used over a longer period. Whitening toothpastes with built-in desensitisers are gentler on your teeth. And always consult your dentist before starting any whitening treatment — they can recommend the safest approach for your specific dental health.
When to see your dentist
If the sensitivity is severe, lasts more than two weeks, or you notice any damage to your gums or enamel, book an appointment. Your dentist can check for underlying issues and recommend appropriate treatment.
Call 01323 723757 or book at www.meadsdental.com Meads Village Dental Practice