Q I want to have my teeth whitened, but they are extremely sensitive. I have been told that whitening is bad for sensitive teeth and can aggravate the problem. What would you advise? James M, Camden, north London

A It is important to realise that not all teeth can be effectively whitened. Dr Mervyn Druian, co-founder of the London Centre for Cosmetic Dentistry (LCCD), near you in Belsize Park, says: “Teeth stained greyish-brown as a result of intrinsic factors [inside the tooth] such as long-term use of tetracycline antibiotics or childhood illnesses are more difficult to whiten. However, if your teeth have been visibly darkened by age or the effects of diet, smoking, or drinking coffee or red wine, then better results can be achieved.”

Regarding sensitivity, acidic fizzy drinks erode the enamel, which results in sensitivity to hot and cold food or liquid. Some fruit and herbal teas and health drinks such as lemon and honey can also cause discoloration, as can vinaigrette dressings and citrus fruit. Use a straw directed away from the teeth when drinking any acidic drinks and follow with a glass of water. Enamel is softest, and your teeth most at risk, after consuming acidic food and drink, so brush them an hour later. Visit your dentist every six months, so that your teeth can be checked for acid erosion.

Most tooth-whitening treatments involve the use hydrogen peroxide (H2O2). The higher the concentration, the more likely you are to experience sensitivity. Diluted forms, used with enhancers such as heat, light or ultrasonic vibrations, generally have fewer side effects.

Ask your dentist about Wy10 (wy10.com ), a new whitening system from Wyten Technology, which is gentler than regular methods. The Wy10 whitening gel contains an organic activator that reacts with hydrogen peroxide, triggering the release of the active ingredients at more than 10 times the normal rate, thereby enhancing the stain-removal efficacy of the hydrogen peroxide. A mini heater is used to enhance the breakdown of peroxide. Tooth whitening with Wy10 at the LCCD (londoncosmeticdentistry.co.uk ) costs £775 for consultation, treatment and a home whitening kit.

At home, try Jason Natural PowerSmile Whitening Toothpaste (£4.95, from health stores). It contains bamboo powder, calcium carbonate and silica to polish the surface of your teeth without harsh chemicals.

Jennifer Harper-Deacon is a registered naturopathic physician and was voted Health Journalist of the Year 2008 by the Health Food Manufacturers’ Association. www.jenniferharper-deacon.com

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Before following any recommendation, consult your GP