Teeth Whitening
A professional way to lift years of staining and brighten the natural shade of your teeth using a controlled peroxide gel. Done properly by a dental professional, it is one of the simplest, most reversible ways to freshen your smile, with results that are noticeable rather than unnatural.
In chair, take home, or both
Professional whitening uses a peroxide based gel to break down the stains that build up in the enamel over the years from coffee, tea, red wine, smoking and simple ageing. There are two main routes. In chair whitening applies a stronger gel under supervision in a single visit, sometimes with a light, for a quick lift. Take home whitening uses custom trays made from impressions of your teeth, worn with a milder gel over a week or two at home. Many clinics combine the two, starting in the chair and maintaining with trays.
A professional shade guide sets realistic expectations beforehand. Whitening lightens natural tooth enamel only. It does not change the colour of crowns, veneers or fillings, which is something a good clinician will point out before you start.
It suits healthy adult teeth and gums with general yellowing or surface staining from food, drink and time. People who want a fresh, brighter smile for an event or simply for confidence tend to be very happy with the result. Because the change is gradual and adjustable, it is easy to aim for a natural brightness rather than an obvious one.
It is not advised for under eighteens, during pregnancy or breastfeeding, or where there is untreated decay, gum disease, exposed roots or heavily worn enamel, which should be addressed first. People with extensive crowns or veneers at the front may see uneven results. Whitening also does little for deep, internal discolouration, where other dental options work better. A dental assessment should come before any whitening.
A short course, then top ups
In chair whitening is usually one appointment of around an hour, sometimes repeated for a stronger result. Take home trays are typically worn daily for one to two weeks until you reach the shade you want. Results commonly last from several months to a couple of years, depending on your diet and habits. Most people keep things fresh with occasional top up tray sessions rather than repeating the full process often. Overusing whitening gel can harm enamel and gums, so follow professional guidance on frequency.
The most common effect is temporary tooth sensitivity, often a sharp, brief twinge to cold, along with possible mild gum irritation if gel touches the gums. These usually settle within a day or two. Sensitivity is more likely with stronger in chair gels. In the United Kingdom tooth whitening is legally a dental procedure, and gels above a certain strength must be supplied by a registered dental professional, so high strength whitening from a beauty salon or unregulated kit carries real risk and is best avoided.
There is no real downtime. You can return to your day straight away. For the first day or two many clinics suggest a clear or white diet, avoiding strongly coloured foods and drinks such as coffee, red wine and tomato based sauces while the enamel is more porous. Using a sensitivity toothpaste around the treatment can help. Results vary from person to person and are never guaranteed.
What you might pay
In the United Kingdom professional whitening commonly runs from about £250 to £700, with take home trays at the lower end and in chair or combined treatment higher. In the United States expect roughly $300 to $1,000, with in chair systems at a leading dental practice toward the top. These are indicative ranges only. Final pricing depends on the method, the practice and your city. Confirm what is included, such as trays and top up gel, with the provider before booking.
Read the full Teeth Whitening cost guide →Whitening lightens natural teeth only. It will not match crowns or veneers, and there is a natural limit to how white healthy enamel can safely go. A trustworthy clinic sets that expectation before, not after.
Teeth whitening should be carried out or supervised by a registered dental professional. This page is general information, not dental advice. Have a dental check before whitening, and confirm the method, strength and aftercare with the provider.
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