Whitening Sensitivity
Why whitening can make teeth feel sensitive, how long it lasts, what you can do about it, and when to get in touch.
Why Are My Teeth Sensitive After Whitening?
Whitening gel passes through the enamel to lift stain from inside the tooth, and while it does, the tooth reacts more to cold. It's common, it's temporary, and it settles within a few days of stopping. It doesn't damage the tooth. A sensitive toothpaste for two weeks before and during whitening, shorter wear times or skipping a night usually keep it manageable. At St Vincent Smile in Finnieston, Glasgow, we check your teeth and gums before you whiten and supervise you as you go, so if sensitivity is severe or doesn't settle, tell us.
Why Does It Happen?
Whitening gel works by passing through the enamel to lift stains inside the tooth. Enamel is porous, and under it is dentine, a softer layer threaded with tiny fluid-filled tubes that run to the nerve. While the gel is working, it makes those tubes more reactive, so cold air, cold drinks and sometimes brushing produce a short, sharp twinge that fades quickly. Some people also notice brief zings in one or two teeth for no obvious reason, usually in the first few days.
It doesn't damage the tooth. The enamel isn't being stripped and the nerve isn't being harmed; the tooth is simply more responsive than usual while the gel is active, and it returns to normal when the course ends.
How Long Does It Last?
Usually only while you're whitening, settling within a few days of stopping. Each session can bring a few hours of sensitivity afterwards, often peaking the day after, which is why people sometimes feel it most on the second or third day. Over a two to three week course it may come and go. Once you stop, it fades, and most people are back to normal within a few days.
If you top up later with your own trays, you may notice it again briefly. The same tricks work then too, and a few nights of gel is usually all a top-up needs.
Worried About Sensitivity?
Ask us before you start.
Who Is More Likely to Get It?
Anyone can, but it's more likely if you already have sensitive teeth. Common reasons are receding gums that expose the root, which has no enamel to protect it; enamel worn thin by hard brushing, grinding or acidic drinks; cracks; and fillings with a worn edge. Untreated decay or gum disease make whitening uncomfortable, and we treat them first.
This is exactly why we check your teeth and gums before you whiten. If we can see a reason you're likely to be sensitive, we can plan around it: treating the cause, suggesting a sensitive toothpaste in advance, or adjusting how you whiten. If one tooth is already sharply sensitive before you start, that needs looking at on its own, because whitening won't fix it and may make it worse. Our guide to sensitive teeth covers the causes.
What Helps
- Start a sensitive toothpaste two weeks before and keep using it during whitening. Spit, don't rinse, so it stays on the teeth, and rub a little onto any sensitive spots at night.
- Wear the trays for a shorter time than the maximum, and build up as your teeth settle.
- Skip a night or two if a session has been uncomfortable. Alternate nights still get you there, just more slowly.
- Avoid very cold food and drinks for a while, and drink through a straw.
- Don't brush straight after whitening. Rinse with water, and brush gently with a soft brush an hour or so later.
- Wipe away excess gel that squeezes out of the trays, so it isn't sitting on your gums.
If you need it, the painkiller you'd normally take for a headache is fine for an evening of sensitivity. Most people find one or two of these changes is enough.
Sore Gums Are a Different Problem
Whitening gel on the gum causes a different kind of discomfort: a sore or white patch where the gel has sat against it, which looks alarming but fades within hours once the gel is removed. It happens when trays are overfilled or don't fit well. Custom trays made from a scan of your teeth keep the gel where it should be, which is why we don't use one-size trays. Use the amount of gel we show you, wipe away any that squeezes out, and if your gums are sore, use less gel at the next session. If a patch doesn't fade, or your gums bleed, stop and tell us.
When to Call Us
Sensitivity that's sharp but brief, comes with cold and fades in seconds, is the normal kind. Contact us if:
- Sensitivity is severe, or stops you sleeping or eating
- It hasn't settled within a few days of stopping
- One tooth is much worse than the others, or hurts when you bite
- Pain lingers for minutes after the cold has gone
- Your gums are sore, white or bleeding
Those can be signs of a crack, decay or a nerve problem that has nothing to do with the whitening and needs its own treatment. Message us on WhatsApp or call 0141 248 1183 and we'll tell you whether to pause, adjust or come in. Pausing for a few days costs nothing: you keep your trays and pick up where you left off.
Sensitive Teeth and Whitening
Often, yes, with adjustments. The sensitive toothpaste routine, shorter wear times and alternate nights are enough for most people with mild sensitivity, and the result is the same, just a little slower. If a tooth is sensitive for another reason, such as recession or a worn filling, we treat that first, which usually makes whitening more comfortable as well.
We'll assess you first, tell you honestly what to expect, and supervise you as you go. Home whitening at St Vincent Smile is £350, or £315 for dental plan members, and it's included in every Invisalign and composite bonding package. If you'd like to ask about sensitivity before you book, message us on WhatsApp.
Questions
This guide is general information, not a diagnosis. A dentist needs to examine you to say what is right for your teeth.