If you’ve seen Crest Whitening Strips all over American TikTok and wondered where to buy them here, the short answer is: you can’t, not legally. Crest Whitening Strips are not sold in UK shops or pharmacies, because they contain far more hydrogen peroxide than UK cosmetics law allows for a product you apply yourself.
This isn’t a marketing gap or a supply issue. Procter & Gamble, the company behind Crest, has confirmed to consumer group Which? that it does not sell this version of the product in the UK or Europe, because the law doesn’t permit it. Strips bought through overseas sellers on sites like Wish, AliExpress or eBay do turn up in the UK, but bringing them in carries real safety risks that this guide explains in full.
Below, you’ll find exactly why Crest strips are restricted here, what UK law actually says about teeth whitening, what happens if you use imported strips anyway, and which legal, effective alternatives are worth trying instead.
Why Crest Whitening Strips Aren’t Sold in the UK
The issue comes down entirely to hydrogen peroxide concentration.
In the US, the American Dental Association permits over-the-counter whitening products containing up to 10% hydrogen peroxide, and most Crest Whitestrips sit at or near that level. Some batches have tested even higher: the European Commission’s product safety notice for Crest Whitestrips recorded measured concentrations of up to 11.9% by weight, sold under names including Professional Effects, Glamorous White and Supreme Flexfit.
UK and EU cosmetics law works very differently. Under the Cosmetic Products Regulation, any tooth whitening product sold directly to consumers for self-application must contain 0.1% hydrogen peroxide or less. Products between 0.1% and 6% can only be supplied to registered dental professionals, and anything above 6% is banned outright for cosmetic use, even in a dental surgery.
Crest Whitestrips exceed the 0.1% consumer limit by roughly 100 times, which is why no legitimate UK retailer stocks them. The European Commission’s official safety alert (submitted by the UK and still listed on local authority trading standards pages such as Bromley Council’s) explicitly states the product does not comply with the Cosmetic Products Regulation, and orders retailers to withdraw it and warn consumers of the risk.
What UK Law Actually Says About Hydrogen Peroxide
It helps to see the full picture rather than just the headline figure:
- Up to 0.1% hydrogen peroxide: legal for anyone to sell directly to consumers, no dentist required. Most UK supermarket and pharmacy whitening strips sit at or below this line.
- 0.1% to 6% hydrogen peroxide: legal, but only when supplied to a registered dental professional, and only for use as part of a dentist-led treatment plan. You cannot buy these yourself, even online, without proof of dental registration.
- Above 6% hydrogen peroxide: not permitted for cosmetic teeth whitening under any circumstances in the UK, regardless of who is applying it.
Because most Crest Whitestrips sit at roughly 6% to 12% hydrogen peroxide, they fall either into the dentist-only bracket or, for the strongest versions, into the banned bracket entirely. That’s true no matter how the product is marketed or which website is selling it.
Is It Illegal to Buy or Import Crest Strips for Personal Use?
This is the grey area most articles skip over, so here’s the honest answer.
Selling non-compliant whitening products to UK consumers is against the law, and trading standards bodies do act on this, as shown by the official safety notices and product withdrawals. The legal risk sits mainly with the seller, not the individual buyer bringing home a small personal quantity.
That said, buying from overseas marketplaces comes with a real safety problem, not just a legal one. When Which? tested teeth whitening products bought through AliExpress, Amazon, eBay and Wish in a UK investigation, it found that 58% of the products tested contained illegal and dangerous hydrogen peroxide levels. One batch of Crest Whitestrips bought through a China-based seller tested at more than 132 times the UK legal limit.
That kind of concentration isn’t a minor technicality. At high strength and with repeated or extended use, hydrogen peroxide can burn the soft tissue of your gums, tongue and cheeks, aggravate existing cavities, and increase tooth sensitivity well beyond what you’d get from a UK-compliant product.
The Real Risks of Using Imported Whitening Strips
Beyond the legal question, here’s what dentists and product safety bodies actually flag as concerns:
Chemical burns and gum irritation. High-strength peroxide gel that leaks past the strip edge, which happens easily if strips don’t fit your tooth shape exactly, can cause visible white patches or burns on gum tissue within minutes.
Enamel sensitivity. Repeated high-concentration use is one of the most common causes of the sharp, lingering tooth sensitivity that whitening strip users report, particularly to cold drinks and food.
No quality control. Products bought through third-party overseas sellers aren’t tested to UK standards before they reach you, and batch strength can vary significantly between listings even for the same product name, as the Which? testing demonstrated.
No dentist oversight. Crest strips aren’t designed with a UK dentist checking your teeth first, so any existing decay, exposed root surfaces or gum recession that would normally rule out whitening won’t get caught before you start.
Voided help if something goes wrong. Because the product isn’t legally sold here, you won’t have the same consumer protection or route to complain that you’d get buying from a UK retailer.
Legal Alternatives That Actually Work in the UK
The good news is you don’t need Crest strips to get a genuinely whiter smile. Two routes work well within UK law.
Low-Peroxide Strips (0.1% Hydrogen Peroxide)
Several UK-compliant brands sell strips at the legal 0.1% threshold, sold openly in pharmacies and online. Results are milder and slower than a 6% to 10% product, but they’re safe for regular use as directed and won’t put you at legal or health risk.
PAP-Based Strips (Peroxide-Free)
A newer option growing fast in the UK market uses phthalimidoperoxycaproic acid, shortened to PAP, instead of peroxide entirely. Because PAP isn’t a peroxide, it falls outside the hydrogen peroxide restrictions altogether and tends to cause far less sensitivity.
UK brands including Hismile, MySweetSmile and Spotlight Oral Care sell PAP or PAP-blend strips, typically priced from around £8 to £40 depending on pack size and formula strength. Reviews and early clinical interest, including coverage in the British Dental Journal, suggest PAP can deliver comparable whitening to low-strength peroxide with noticeably less discomfort, though it’s still a newer technology than peroxide whitening.
Professional Dentist Whitening
If you want the strongest legal result, a UK dentist can use hydrogen peroxide gel up to the 6% limit, applied and monitored under professional supervision. According to UK dental cost guides published in 2026, professional whitening typically runs from around £200 up to £800 or more, depending on the clinic, location and whether it’s a single session or a full course with take-home trays.
Whitening isn’t available on the NHS for cosmetic purposes, so this is a private-only treatment regardless of which dentist you use. Prices vary a lot by region and clinic, so get a quote before committing.
How to Check If a Whitening Product Is Legal in the UK
Before buying anything, whether in a shop or online, a few quick checks help you avoid the products flagged in official safety alerts:
- Check the ingredients list for hydrogen peroxide or carbamide peroxide, and look for a stated percentage. If none is listed at all, treat that as a warning sign rather than reassurance.
- Be wary of any product openly marketed as “US strength” or “as seen in America,” since that’s often a signal it exceeds UK limits.
- Buy from a UK-based retailer with a UK returns address, rather than a marketplace listing shipped from overseas with no clear seller information.
- If a product claims results “as strong as the dentist” without mentioning any professional supervision, treat that claim with real scepticism, since genuinely dentist-strength products can’t legally be sold to you directly.
FAQs
Are Crest Whitening Strips banned in the UK?
They’re not sold legally in the UK because most versions contain far more hydrogen peroxide than the 0.1% limit allowed for consumer self-whitening products. Procter & Gamble has confirmed it doesn’t distribute this product in the UK or Europe for exactly this reason.
Can I buy Crest Whitestrips online and have them shipped to the UK?
Some overseas sellers will ship them, but Which? testing found a significant proportion of imported whitening products, including Crest strips bought this way, contained dangerous and illegal hydrogen peroxide levels, in one case over 130 times the UK limit. The legal risk sits mainly with the seller, but the safety risk sits with you.
What hydrogen peroxide percentage is legal in the UK?
Consumer products you apply yourself are capped at 0.1% hydrogen peroxide. Products between 0.1% and 6% can only be supplied to registered dentists, and anything above 6% is banned for cosmetic whitening entirely, according to the Cosmetic Products Regulation.
Why do Crest strips work so much better than UK ones?
Higher hydrogen peroxide concentration bleaches stains faster and more visibly, which is exactly why US strips at 6% to 10% show quicker results than UK strips capped at 0.1%. That extra strength is also what pushes them outside UK safety limits.
Are PAP whitening strips as effective as Crest?
Early UK reviews and some clinical coverage suggest PAP strips can deliver comparable whitening results to low-strength peroxide products, with less sensitivity, though they’re a newer technology with a shorter track record than peroxide whitening. Results still depend on consistent use over the full treatment course.
Is it safe to dilute high-strength whitening gel myself?
No, home dilution isn’t a reliable safety method, since you can’t accurately measure or control the resulting concentration, and uneven mixing can leave some areas of gel far stronger than others. Stick to products formulated and tested at a legal, consistent strength instead.
Can a UK dentist give me something similar to Crest strips?
Yes, a dentist can prescribe or apply hydrogen peroxide gel up to the legal 6% limit, which is considerably stronger than anything sold over the counter in the UK. This typically costs £200 to £800 or more privately, since cosmetic whitening isn’t covered by the NHS.
Will Crest strips damage my teeth permanently?
Used exactly as directed, whitening strips generally don’t cause permanent enamel damage, but overuse, extended wear time, or unusually high concentrations increase the risk of sensitivity and gum irritation. Products tested well above UK legal limits, as some imported Crest strips have been, carry a meaningfully higher risk profile than UK-compliant alternatives.
