The rise of illegal tooth whitening in Britain — what to check before you book

Tooth whitening is booming — and so is an unlicensed black market offering it. Here's how to tell the difference.

Tooth whitening has become one of the most in-demand cosmetic treatments in Britain, with the industry now estimated at around £40 million a year. Done by a qualified professional, it's safe and effective. Done outside the law, it's a genuine health risk — and it happens more often than most people realise.

What the law actually says

• Only a dentist, dental hygienist or dental therapist can legally perform tooth whitening — not a beauty salon or hairdresser, regardless of what they advertise.
• "I didn't know it was illegal" isn't a defence — providers are liable even if a supplier or trainer told them otherwise.
• Fines for illegal tooth whitening are unlimited in Britain, and every prosecuted case to date has succeeded.
• Handing you whitening trays yourself, even if you apply them, still counts as practising dentistry illegally if the provider isn't a registered dental professional.
• UK and EU rules restrict whitening products to a maximum of 0.1% peroxide outside professional dental settings — anything stronger, offered outside a registered practice, is a red flag.

Why it matters for your health

The rules exist because peroxide-based whitening, used incorrectly or at unsafe concentrations, can cause chemical burns to the mouth, lips, gums and tongue — some of them permanent. Done badly, it also frequently just doesn't work, leaving you with sensitive teeth and no result to show for it.

If you're ever unsure whether a whitening provider is legitimate, you can check their registration with the General Dental Council, or report a suspected illegal provider to them directly. Whitening done properly, by a registered professional, is one of the safest and most effective cosmetic treatments available — it's worth insisting on the real thing.