How much does teeth whitening really cost in 2026?

Teeth whitening is probably the treatment patients ask me about most often, and it's also the one surrounded by the most misleading information. Supermarket strips, LED kits advertised on Instagram, "professional-grade" products at £30. The market is full of impressive-sounding claims. Here's an honest breakdown of what actually works, what it costs, and what you should realistically expect.

Why over-the-counter products rarely deliver

The short answer is regulation. UK law caps the hydrogen peroxide concentration in over-the-counter whitening products at 0.1%. Hydrogen peroxide is the active ingredient in whitening. It's what penetrates the enamel and breaks down the staining compounds inside the tooth. At 0.1%, the effect on intrinsic staining (the colour of the tooth itself) is negligible. You might see a very slight surface improvement, but it won't change the underlying shade.

By contrast, a dentist can legally supply whitening products containing up to 6% hydrogen peroxide (or 16% carbamide peroxide, which breaks down to an equivalent concentration). That's the threshold at which whitening actually works on tooth structure, not just the surface.

This is why dentist-supplied whitening produces visible, lasting results and most shop-bought products do not. It has nothing to do with the blue LED lights, the fancy packaging, or the influencer endorsements. It's the peroxide concentration. The law is actually protecting consumers here, even if it makes the legitimate version more expensive.

The two options at Bowling Green

Who is suitable for whitening?

Whitening works best on naturally coloured teeth with extrinsic staining: the kind that accumulates from coffee, tea, red wine, and tobacco over years. The results are typically very good. There are situations where it works less well, and I'd rather tell you that upfront:

• Crowns, veneers and white fillings:these don't respond to peroxide. Only natural tooth enamel whitens. If you have visible restorations on your front teeth, whitening the surrounding natural teeth may create a mismatch.
• Tetracycline staining:if your teeth are grey or banded from tetracycline antibiotic use in childhood, whitening can help but the results are more variable and may require extended treatment. I'll give you an honest assessment of what's achievable.
• Very grey or heavily intrinsically stained teeth: whitening may produce some improvement, but veneers or composite bonding may ultimately achieve a better aesthetic result.

I always assess suitability at a consultation before starting. If whitening is unlikely to achieve what you're hoping for, I'll tell you and discuss whether an alternative like veneers or composite bonding would be more appropriate.

Whitening during pregnancy or breastfeeding is not recommended. Patients with existing significant tooth sensitivity should mention this before starting. We can adjust the protocol, usually by reducing the concentration or wear time, to minimise discomfort.

Will it last?

This is the answer nobody entirely wants to hear: whitening is not permanent. Your teeth will gradually restain over time, particularly with regular coffee, tea, red wine or tobacco. For most patients, the result stays noticeably brighter for one to two years before they want to top it up.

The good news: if you have the custom trays, topping up is inexpensive. You can buy additional whitening gel from us directly, at much less than the original cost, and do a few nights of top-up treatment as needed. Many patients do this once or twice a year. It's much more manageable than people expect.

A word on salon and mobile whitening

I get asked about this regularly, so I'll be direct. In the UK, carrying out teeth whitening is a restricted act. Legally, it can only be performed by or under the prescription of a registered dental professional. The GDC has taken action against salons, beauticians and mobile operators who offer whitening treatments. This isn't bureaucratic technicality: the products used in illegal settings are often well above the legal concentration, and without properly fitted custom trays, the gel spreads onto the gums and soft tissue. Chemical burns to gum tissue are painful, slow to heal, and entirely avoidable.

If you see whitening advertised at a nail bar, beauty salon or via a social media operator, the honest advice is to avoid it. It's not worth the risk.