Teeth Whitening Myths and Facts: Separating Science from Hype

Teeth whitening carried out under a dentist's supervision at appropriate concentrations is generally considered safe for healthy teeth and does not strip away enamel. The real risks come from unregulated home remedies, overuse, and whitening while untreated decay or gum problems are present.

There is a lot of conflicting information online. Some of it causes needless worry, while some presents genuinely harmful methods as harmless. Below we look at the most common teeth whitening myths and what the evidence actually says.

Myth: whitening damages tooth enamel

Professional whitening products contain hydrogen peroxide or carbamide peroxide. Rather than wearing enamel away, they work by breaking down the stain molecules inside the enamel and dentine. Used according to a proper protocol, the structure of the enamel is preserved.

The most common side effect is temporary sensitivity, particularly to cold and heat, which usually settles by itself within a few days. Gum irritation can also occur, which is why the gel should be kept off the gums and trays should fit well.

Do home remedies like baking soda, charcoal and lemon work?

Most home remedies do not change the actual colour of your teeth; at best they scrub off surface stains. That scrubbing is exactly what harms enamel. Enamel cannot regenerate, and as it thins, the yellower dentine underneath shows through more.

• Baking soda: mildly abrasive. Occasional use may reduce surface staining, but frequent, hard brushing can wear enamel and the gum line.
• Activated charcoal: there is no strong scientific evidence that it whitens. It can be abrasive, and most charcoal products contain no fluoride.
• Lemon juice and apple cider vinegar: acidic. They can soften enamel and cause erosion, making teeth look more yellow and feel more sensitive.
• Strawberries and oil pulling: no proven whitening effect, and no substitute for professional treatment.

Other common whitening misconceptions

A few other beliefs lead either to false hopes or to unnecessary disappointment. These are the ones we hear most often:

• "Whitening also lightens fillings and crowns." It does not. Composite fillings, veneers and crowns keep their colour and may need replacing to match afterwards.
• "Whiter always means healthier." Not true. Natural tooth shade varies, and a slightly yellow tone can be perfectly healthy.
• "Whitening toothpaste changes the colour of teeth." It mostly reduces surface stains rather than noticeably lightening the tooth itself.
• "Anyone can have their teeth whitened." Decay, gum disease or marked sensitivity should be treated first, and whitening is usually postponed during pregnancy and breastfeeding.

Professional teeth whitening options

Under a dentist's supervision there are two main approaches: in-surgery whitening and home whitening with custom-made trays. In-surgery whitening uses a stronger gel while the gums are protected with a special barrier. Home whitening uses a lower-concentration gel in trays made from impressions of your teeth, worn for a period your dentist sets.

Which option suits you depends on your current shade, the cause of the discolouration, any sensitivity and your expectations. Some internal discolouration responds only partially to whitening, in which case your dentist can discuss other cosmetic options.

How long do teeth whitening results last?

Whitening results are not permanent, but with the right habits they can last a long time. How long depends on how much coffee, tea, red wine and tobacco you consume, your oral hygiene and your teeth's starting shade.

To maintain your results, rinse with water after dark drinks, stop smoking, keep up regular professional cleaning and, if your dentist recommends it, have occasional top-up treatments. To find out whether whitening is suitable for you, you can book an examination with Dr. Merve Hakan in Baku.