You’ve probably seen the whole spectrum by now. A £25 kit in the supermarket aisle. A beauty salon offering a session for £79. And a dental practice quoting £500.
Same treatment, surely?
Not remotely. And the gap between those numbers is worth understanding before you spend anything, because one of those options is illegal, one is legally prevented from working, and only one is likely to give you the result you’re picturing.
The short answer
Teeth whitening cost in the UK generally runs between £200 and £800 for professional treatment, depending on which route you take.
| Option | Typical UK cost | Timescale |
|---|---|---|
| Dentist-supplied take-home kit | £175 – £500 | 2 – 3 weeks |
| In-chair whitening at a practice | £300 – £800 | One appointment, 45 – 90 minutes |
| Combined in-chair and take-home | £400 – £800 | One visit plus 1 – 2 weeks |
| Top-up gel once you own your trays | £30 – £80 | A few nights |
| Shop-bought kit | £20 – £60 | Weeks, with very limited effect |
These are ranges compiled from published UK practice pricing in 2026, not fixed figures – every practice sets its own fees, and what’s included varies enormously. Treat them as a guide for comparing quotes rather than a price list.
London and the South East sit at the higher end of every one of those ranges. As practices serving Romford, Harold Hill, Gants Hill and Ilford, we’re in that bracket geographically, though not usually at central London prices.
Why the range is so wide
Four things move the number.
Which method. Take-home kits are cheaper because you’re doing the work. In-chair whitening uses a stronger gel applied by a clinician, so you’re paying for surgery time.
Which system. Premium systems cost the practice more to buy in, and that’s reflected in the fee.
How many appointments are included. Some quotes cover consultation, impressions, trays, gel and a review. Others cover the gel and little else.
Where you are. A practice in Greater London carries higher overheads than one in a market town. The treatment itself is identical.
Dentist-supplied take-home whitening
This is what most people end up choosing, and for good reason.
Your dentist checks your teeth and gums are healthy, takes a scan or impressions, and has custom trays made to fit your mouth exactly. Not the one-size-fits-nobody trays in a pharmacy kit – moulded to your teeth, so the gel sits where it’s meant to and stays off your gums.
You then wear them at home, usually overnight or for around 30 to 60 minutes a day, for roughly two to three weeks.
Results build gradually rather than appearing overnight, but the final shade is usually comparable to in-chair whitening. You’re trading speed for cost. How many shades lighter you end up depends on your starting colour, the type of staining and how closely you follow the instructions – which is why we’d rather show you a shade guide at a consultation than promise a number here.
One legal detail worth knowing: the first treatment must be carried out by the dental professional before you can be given the kit to continue at home. A practice that posts you a kit without seeing you isn’t following the rules.
Typical UK cost: £175 to £500.
In-chair whitening
Done in a single appointment, usually 45 to 90 minutes. Your gums are isolated and protected, a professional-strength gel is applied, and it’s often activated with a light.
You walk out with the result the same day, which is why people choose it before weddings and holidays.
Typical UK cost: £300 to £800, with premium light-activated systems reaching higher.
The bit nobody mentions: top-ups
Whitening isn’t permanent. Tea, coffee, red wine, curry and tobacco will gradually pull the shade back down.
The good news is that once you own custom trays, maintaining the result is cheap. A top-up syringe of gel costs somewhere around £30 to £80, and a night every couple of months is usually enough to hold the colour.
This is worth factoring in when you compare quotes. An in-chair treatment with no trays means you start from scratch when it fades. A package that includes trays gives you a maintenance route.
What about the £30 kits?
Here’s the part that explains everything.
In the UK, whitening products sold direct to the public are limited by law to 0.1% hydrogen peroxide. A dental professional can legally use products up to 6% – around sixty times stronger.
That’s the entire difference. The Oral Health Foundation puts it plainly: over-the-counter kits in the UK contain too little hydrogen peroxide to noticeably lighten the teeth.
Most of what people perceive as a result from whitening toothpastes and strips is surface stain removal, which a hygienist appointment achieves more effectively.
NB if a product sold to you over the counter claims dramatic whitening, either it’s overselling or it contains more peroxide than it legally should. Neither is a good sign.
And the £79 salon offer?
This one matters more, so we’ll be blunt about it.
In the UK, only GDC-registered dental professionals may legally whiten teeth. The General Dental Council is clear that only dentists, dental therapists, dental hygienists or clinical dental technicians working to a dentist’s prescription can provide it. A beautician, a salon or a mobile whitening service is committing an offence, whatever training certificate they hold.
This isn’t a grey area. The High Court settled it in GDC v Jamous (2013), confirming that tooth whitening is the practice of dentistry regardless of which products are used. The offences carry an unlimited fine in England and Wales.
The practical risk to you isn’t legal, though – it’s clinical. Nobody has checked whether you have decay, gum disease or a cracked filling before applying a bleaching agent. The NHS is direct about this too, warning that whitening from places like beauty salons may harm your teeth and gums.
You can check anyone’s registration free on the General Dental Council website. It takes about thirty seconds.
One more legal point: products releasing more than 0.1% hydrogen peroxide cannot be used on anyone under 18, other than in the narrow circumstance of treating or preventing disease.
Is teeth whitening available on the NHS?
No. The NHS states plainly that teeth whitening is not available on the NHS and must be paid for privately.
You may see claims online that exceptions exist for severe discolouration with a medical cause. We’d be cautious about that – it isn’t something the NHS itself sets out, and we wouldn’t want you booking an appointment expecting it. If discolouration in your case stems from a genuine clinical problem rather than staining, that’s worth raising with your dentist, but treat it as a conversation rather than an entitlement.
If you’re weighing up what the NHS covers against private treatment more generally, our guide to NHS and private dentistry sets out where the line falls.
What a fair quote should include
Before you commit anywhere, ask what the price covers. A complete quote should include:
- A consultation and clinical check before anything starts
- Scans or impressions
- Custom-made trays you keep
- The full course of gel
- A review appointment
- Clear pricing on top-up gel afterwards
If a quote is notably cheaper than everything around it, one of those is usually missing. Trays are the one to ask about specifically – they’re the expensive component, and they’re what makes future maintenance affordable.
Whitening won’t work on everything
Worth knowing before you spend.
It doesn’t work on dental work. Whitening gel has no effect on dentures, crowns, white fillings or bridges, and the same applies to porcelain veneers and composite bonding. If you have any of these on your front teeth, whitening the natural teeth around them will make them stand out rather than blend in. That’s a conversation to have first, not afterwards – and it’s why we suggest whitening before any cosmetic work, so new fillings and restorations can be matched to the lighter shade.
Some stains respond better than others. General yellowing from age, tea and coffee usually lightens well. Grey tones and staining from within the tooth are more stubborn.
Sensitivity is common. It’s usually mild and temporary, and better systems include a desensitising agent. If you already have sensitive teeth, tell your dentist – it changes what we’d recommend. We’ve written separately about why whitening causes sensitivity and how long it lasts.
What we use
At both our clinics we work with Boutique Whitening and Enlighten Evolution.
Enlighten states that its system guarantees the B1 shade – the lightest shade on the standard dental guide – provided the protocol is followed properly. That’s the manufacturer’s claim rather than an independent finding, but it’s a genuine commitment and it’s the only UK system offering it. Treatment combines around two weeks of overnight home whitening with a final stage in the practice, and the formula includes a desensitiser.
Boutique is a dentist-supplied home system available in a range of gel strengths, which gives more flexibility on wear time and sensitivity.
Which suits you depends on your starting shade, how sensitive your teeth are, and your timescale. That’s what the consultation is for. Our dentists will tell you honestly which is the better fit, and if neither is right for your teeth, we’ll say that too.
So is cheap teeth whitening worth it?
If “cheap” means a dentist-supplied home kit rather than in-chair treatment, then yes. Same active ingredient, same clinical oversight, and usually a comparable final shade. You’re being patient instead of paying for speed. For most people it’s the sensible choice.
If “cheap” means a salon, a mobile service or a supermarket kit, then no. One is illegal and clinically unsupervised. The other is legally prevented from being strong enough to work.
The honest summary is that professional whitening isn’t cheap, but it is straightforward, and the price differences between practices usually come down to what’s included rather than to quality.
Thinking about whitening? We’ll check your teeth are suitable and give you a written quote before anything begins – including what top-ups will cost later, so there are no surprises. Call Gants Hill on 0208 554 5691 or Romford on 01708 346 212, or get in touch online.
You can see our whitening results, read our patient reviews, or browse the full range of treatments we offer.
