Teeth whitening is one of the most popular and accessible cosmetic dental treatments, but the range of options, from professional treatments to supermarket gels, can make it difficult to know what will actually deliver a result. This is a clear guide to how each approach works and why professional whitening consistently outperforms over-the-counter alternatives.
The active ingredient in all effective whitening treatments is a peroxide compound, either hydrogen peroxide or carbamide peroxide. This compound penetrates the enamel and breaks down the chemical bonds that cause staining, lightening the colour of the tooth from within. The strength of the peroxide and the length of contact time determine the degree of whitening achieved.
Products sold over the counter in the UK are legally limited to very low concentrations of peroxide. Products sold without a dental prescription may not contain more than 0.1% hydrogen peroxide. This concentration is too low to achieve meaningful whitening. Most over-the-counter products work primarily through abrasion, removing surface stains rather than changing the underlying tooth colour.
For patients hoping for a genuinely lighter smile, over-the-counter products are unlikely to deliver the result they are looking for.
Professional whitening prescribed by a dentist uses significantly higher concentrations of peroxide, up to 6% hydrogen peroxide or 16% carbamide peroxide for home use, within UK dental regulations.
Custom-made trays are fabricated from a precise digital scan of your teeth and worn for a prescribed period each day or overnight. The active gel is loaded into the tray, which holds it in contact with every tooth surface for optimal, even whitening.
At Berkhamsted Dental, our professional home whitening kits are among the most popular cosmetic treatments we offer. Results typically develop over two to four weeks and can lighten teeth by several shades.
In-chair whitening uses a higher-concentration gel applied directly to the teeth by a clinician, often with a light to accelerate the process. The appointment typically takes one to two hours and can achieve immediate results.
In-chair whitening is particularly effective for patients who want a fast result. For longer-lasting results, it is often combined with a course of home trays.
Both professional options work well when used correctly. Home trays offer a gradual, controllable result and are the most cost-effective for ongoing use. In-chair whitening delivers a faster result and is ideal for patients with a time-sensitive goal.
Importantly, whitening affects only natural tooth structure. Crowns, veneers, or composite bonding will not respond to whitening. If you have existing restorations in visible areas, this needs to be discussed at your consultation.
Teeth whitening at Berkhamsted Dental begins with a consultation to assess your suitability and recommend the approach most likely to deliver the result you are looking for. Book yours today.
Whether you’re booking your first appointment, have a question about our treatments, or simply want advice on your dental care — our friendly team is here to help.
