Whitening and Sensitivity
The mechanism inside the tooth, how long the sharp moments go on for, who tends to get them, fixes that genuinely help, and the signs that suggest a different cause altogether.
Should I Expect Sensitive Teeth After Whitening?
You should, and it's nothing to worry about. The peroxide gel has to travel through the enamel before it reaches the stain, and while it's active the tooth responds more sharply to cold. The effect is temporary, causes no damage and generally disappears within days of the final session. Using a sensitive toothpaste from early on, shortening sessions or skipping a night all keep it in check. At Ferry Smile Studios your teeth are examined by a dentist beforehand and the course is supervised, so let us know if it's intense or doesn't fade.
The Science in Brief
Beneath the enamel sits dentine, a layer riddled with tiny channels full of fluid running in towards the nerve. Getting at the stain means the peroxide gel has to cross the enamel and enter that dentine. For as long as it's there, the nerve is more easily provoked, so a cold drink, a gulp of winter air off the Tay or even toothbrushing can set off a sharp pang that's gone within seconds.
A few people also get what are known as "zingers": an abrupt jolt in a single tooth with no apparent trigger, mostly during the opening days of the course. Unpleasant, certainly, but harmless. Neither is the enamel being eroded nor the nerve injured. Once the gel has cleared and the course is over, the tooth returns to how it was.
The Usual Timescale
Sensitivity typically comes and goes throughout the course and fades within a few days of the final session. It often peaks a few hours after the trays come out, and for some people days two and three are the worst before things improve. Many find it diminishes as the course progresses.
A later top-up might bring a short-lived return. Because a top-up lasts only a few nights, any sensitivity tends to be mild, and the remedies below work just as well.
Worried About Sensitivity?
Send us a message before you begin, or partway through, and a dentist will get back to you.
People More Prone to It
Anyone can get it, but teeth that were already sensitive are more likely to. The usual culprits:
- Receding gums that have exposed root surface, which has no enamel covering
- Enamel thinned by scrubbing, grinding or acidic drinks
- Worn-down edges or hairline cracks
- Older fillings with a gap at the edge
- Decay or gum disease still awaiting treatment, which is always sorted out before whitening
This is the reason a dentist examines you before prescribing. Where a likely cause is visible, we plan around it: treating it, getting you onto a sensitive toothpaste early, or altering how you whiten. One tooth that's already sharp before you start needs assessing on its own, because whitening won't improve it and could aggravate it. The common causes are covered in our sensitive teeth guide.
Straightforward Remedies
| What to do | How it helps |
|---|---|
| Desensitising toothpaste, begun two weeks before | Blocks the dentine channels. Spit, don't rinse, and rub a little onto tender spots last thing at night |
| Reduce the wear time | Less gel contact; build it back up gradually as the teeth adjust |
| Whiten on alternate nights | Lets the nerve recover. Slower, but you reach the same shade |
| Steer clear of ice-cold food and drink | Removes the main trigger while the teeth are reactive; a straw helps with cold drinks |
| Hold off brushing after a session | Rinse with water, leave it about an hour, then brush gently |
| Wipe off surplus gel | Prevents gel lingering on gums and teeth longer than it should |
One or two of these usually does the trick. For an evening of real discomfort, your usual headache remedy is fine, though it rarely comes to that.
Gum Soreness Is a Separate Issue
Gel resting on the gum produces something different: a sore or whitened patch where it sat. It can look worrying, but it normally fades within hours once the gel is removed. The cause is overfilled or ill-fitting trays. Trays made from a scan of your own mouth hold the gel against the teeth and nowhere else, which is why we don't use generic ones.
Load the amount we demonstrated and wipe off any excess that squeezes out. Use a little less the next night if a gum is tender. Should a white patch still be there the next day, or if your gums bleed, stop and contact us.
Signs That Need a Phone Call
Normal whitening sensitivity is sharp, over quickly and triggered by cold. Get in touch if:
- It's intense, disturbs your sleep or stops you eating
- You've stopped whitening and it persists several days later
- One tooth is noticeably worse, or hurts when you bite
- The ache lingers long after the cold has passed
- A gum is bleeding, or has a white or painful patch
Any of these could point to a crack, a cavity or an inflamed nerve, none of which whitening causes and all of which need treating in their own right. Phone 01382 477350 or send a WhatsApp message, and a dentist will tell you whether to pause, change the routine or come in. Pausing for a few days costs you nothing; your trays and gel will keep.
Already Sensitive? You Can Usually Still Whiten
Mild sensitivity rarely rules whitening out. Sensitive toothpaste, shorter sessions and whitening on alternate nights are generally sufficient, and you reach the same final shade, just a little more slowly. Where one tooth is sensitive for a particular reason, an exposed root or a leaking filling for instance, sorting that out first tends to make the rest of the course easier.
Boutique home whitening at Ferry Smile Studios is £350, or £315 for dental plan members, and it's included in every Invisalign and bonding package. 1 UK law requires a dentist's prescription, and a dentist reviews your progress along the way.
Questions
This guide is general information, not a diagnosis. A dentist needs to examine you to say what is right for your teeth.