That depends on your starting point and what your teeth respond to. Most patients see a noticeable change, typically 3-8 shades brighter on the standard dental shade chart. We'll give you a realistic estimate at your consultation.

Yes. The prescription gels we use are well-tested and safe when used in custom trays. The most common side effect is temporary sensitivity, which settles within a few days of finishing the course.

Some patients get mild sensitivity during the two-week course, particularly to cold drinks. It's temporary and settles quickly after you finish. If you already have sensitive teeth, tell us before we start and we'll adjust the protocol.

Typically 1-3 years before most patients want to top up. Diet, coffee, tea, red wine and smoking all affect how long the result holds. Top-ups are quick and only cost the price of additional gel.

No. Whitening only works on natural tooth enamel. Crowns, veneers and old fillings won't change colour. If you have visible crowns or veneers that no longer match your other teeth, we may suggest whitening first and then replacing the crown or veneer to match.

Strength, fit and safety. Over-the-counter products are limited by law to much weaker concentrations of bleach, so they take longer and produce less of a result. The trays are also one-size-fits-all, which means the gel can leak onto gums and cause irritation. Custom trays plus prescription-strength gel is the difference.

Yes. Tooth whitening at Tangmere is done by our Dental Therapists, who are trained to provide it directly. You don't need to see the dentist first.