Teeth whitening: what actually works, and what wastes your money

Whitening is the treatment people ask about most, and it is also where the most money gets wasted.

What does not work

Charcoal powders. Abrasive. They scrub off surface stain and, over time, enamel. Once enamel thins, the yellow dentine underneath shows through more — the opposite of what you wanted.

Most whitening toothpastes. They remove some surface staining. They do not change the underlying shade of the tooth. Useful as maintenance, useless as treatment.

What works

Professional in-clinic whitening. A controlled-strength gel with the gums fully isolated. Typically three to four shades in one session, done under supervision.

Dentist-supplied home kits. Custom trays with a lower-strength gel worn over two weeks. Slower, gentler, and good for maintenance.

Who should not whiten

Whitening does not change the colour of crowns, veneers or composite fillings. If you have a white filling on a front tooth, it will stay the shade it is while everything around it gets brighter. That needs planning first — which is exactly what the consultation is for.

Managing expectations

Whitening lifts your natural shade. It does not produce the fluorescent white you see in filtered photographs, and it should not. A good result looks like your own teeth on their best day.