Teeth Whitening Costs in London: What You Are Actually Paying For

Whitening is one of the few dental treatments where the raw material is visible and apparently simple. A syringe of gel. It is therefore the treatment where patients most often wonder why a professional course costs what it does when something that looks similar can be bought online.

The answer is partly regulatory, partly clinical, and partly that the gel is a small component of what is being provided.

This is not a marketing distinction. It is law.

Tooth whitening is a dental act. Under the relevant UK regulations, products containing or releasing more than 0.1% and up to 6% hydrogen peroxide may only be supplied to a dental practitioner, and the first use in each cycle of treatment must be carried out by a dental professional or under their direct supervision. Products above 6% are not permitted for cosmetic tooth whitening at all.

Products sold to the public without dental involvement are therefore restricted to 0.1% or below — a concentration that produces very limited change. Anything sold direct to consumers claiming a substantial whitening effect is either working through abrasion rather than bleaching, or is being supplied outside the regulations.

Whitening carried out by someone who is not a registered dental professional is illegal practice, and this has been prosecuted. Beauty salons offering whitening are a recurring subject of enforcement action.

The person treating you should be registered with the General Dental Council, and registration is publicly searchable.

Whitening is not appropriate for every mouth, and applying peroxide to an unassessed one has consequences.

Untreated decay allows the gel to reach the pulp directly, which is painful and can damage the nerve. Exposed dentine at the necks of teeth causes marked sensitivity. Active gum disease is aggravated. Cracks allow penetration. And a tooth that is discoloured because the nerve has died does not respond to external whitening at all — it needs a different technique applied from inside the tooth.

An assessment establishes what is causing the discolouration and whether whitening is the appropriate response. Extrinsic staining from coffee, tea, red wine or tobacco sits on the surface and often responds better to professional cleaning than to bleaching — our article on stain removal for coffee and tea drinkers and our article on airflow stain removal compared with whitening cover the distinction, which genuinely changes what you should pay for.

Intrinsic discolouration within the tooth structure responds differently again depending on its cause. Tetracycline staining, fluorosis and age-related darkening all behave differently.

Baseline photographs and shade recording matter more than patients expect, because perception of one's own teeth drifts. Without a documented starting shade, it is difficult to judge afterwards how much change occurred.

For take-home whitening, this is the substantial laboratory component.

A custom tray is made from an accurate impression or scan of your teeth. It is trimmed to follow the gum margin precisely, and often incorporates small reservoirs to hold gel against the tooth surface. The purpose is to hold the gel on the enamel and off the gums — peroxide on gum tissue causes chemical burns, which is the most common complication of poorly fitting trays.

Generic one-size trays cannot do this. They sit loosely, gel escapes onto the gums, and contact with the teeth is uneven, producing patchy results.

Different concentrations suit different regimes. Lower concentrations are worn for longer periods, sometimes overnight; higher concentrations for shorter daily sessions. The choice depends on your sensitivity, your discolouration and your routine. The number of syringes included varies between practices and is worth confirming.

Where whitening is carried out in the practice, the fee reflects clinical time, isolation of the gums with a protective barrier, and the higher-concentration products that may only be applied professionally.

Checking progress, managing sensitivity, and adjusting the regime.

Take-home whitening with custom trays is the approach with the most established evidence base. It works gradually over one to three weeks, allows the regime to be adjusted for sensitivity, and leaves you with trays you can use for maintenance.

In-surgery whitening produces visible change in a single appointment. Some of the immediate effect is dehydration of the enamel, which makes teeth appear lighter temporarily and reverses over the following days, so the settled result is less dramatic than the immediate one.

Combined approaches use an in-surgery session followed by take-home trays, which is common where a visible change is wanted quickly with a durable result.

Our article on comparing in-office and at-home whitening covers the practical differences.

This is the most important thing to understand before comparing prices.

How much a tooth lightens depends on the cause and depth of the discolouration, the thickness and translucency of your enamel, the underlying dentine shade, your age, and how your teeth respond to peroxide. These vary considerably between individuals and cannot be predicted precisely in advance.

A reasonable practitioner will tell you what is likely, what is unlikely, and where the limits are. Anyone quoting a specific number of shades in advance is describing a typical outcome, not a commitment.

Certain things also will not change:

Crowns, veneers, bridges and fillings do not whiten. They are made of materials that peroxide does not affect. If you have a crown or a white filling on a front tooth, whitening the surrounding teeth will leave it standing out, and it may need replacing to match — a cost that should be discussed before you start, not after. Our article on whitening with crowns covers this.

Teeth discoloured because the nerve has died need internal whitening, which is a different procedure.

White patches from fluorosis can become more noticeable initially, as the surrounding enamel lightens at a different rate.

Transient sensitivity affects a substantial proportion of people during whitening. It is caused by peroxide passing through enamel and dentine to the pulp, provoking a reversible inflammatory response.

It typically settles within a day or two of stopping, and is managed by reducing wear time, using alternate days, or using a desensitising product. It is not a reason to avoid whitening, but it is a reason to have a regime that can be adjusted. Our article on whether whitening hurts and how long sensitivity lasts covers the management.

Whitening is not a one-off purchase. The result fades.

Teeth pick up stain continuously from diet and habits, and the underlying dentine continues to darken slowly with age. Most people find the result holds for somewhere between one and three years before they want to refresh it, with considerable variation depending on diet, smoking and cleaning habits. Our article on how long professional whitening lasts covers the factors.

Maintenance is straightforward if you have custom trays — a single syringe of gel for a night or two. The trays themselves last a few years with care, and will need remaking eventually or if your teeth move.

Habits affect this substantially. Our article on how regular coffee consumption stains teeth covers one of the main contributors, and regular hygiene appointments remove surface staining that would otherwise be mistaken for the whitening wearing off.

• Is an assessment with radiographs included, and is it charged separately?

• Are the trays custom made, and are they included?

• How many syringes of gel are supplied, and what does a refill cost?

• Is a review appointment included?

• What happens if sensitivity means I need to pause?

• Do I have any existing crowns, veneers or fillings that will not match afterwards?

• Who is carrying out the treatment and are they GDC registered?

• What does maintenance cost in a year or two?

Our pricing page sets out our fees, and our page on teeth whitening covers what the treatment involves.

• UK regulations restrict whitening products above 0.1% peroxide to supply through dental professionals, with a 6% upper limit for cosmetic use.

• Whitening carried out by someone not registered with the GDC is illegal practice.

• The fee covers assessment, records, custom trays, gel and review — not just the gel.

• Custom trays hold peroxide on enamel and off gum tissue, which is what prevents chemical burns.

• Crowns, veneers and white fillings do not whiten and may need replacing to match.

• The result fades over one to three years, so maintenance is an ongoing consideration.

If you are considering whitening, an assessment establishes what is causing the discolouration and whether bleaching is the appropriate response. You can contact our team to arrange one, read about our approach to teeth whitening, or see our pricing page.

This article is provided for general information only and does not constitute dental advice. Suitability for tooth whitening can only be determined through clinical examination and radiographs by a registered dental professional. Results vary considerably between individuals and cannot be predicted in advance. Fees vary by practice and by the treatment provided.

Next review due: 18 August 2027