How long does professional teeth bleaching last
Professional bleaching fades gradually as new stains accumulate, and its visible effect depends on enamel, diet, smoking, and maintenance.
The short answer
Professional teeth bleaching lightens natural enamel, but the shade gradually changes as teeth take up new pigments and as the tooth’s internal colour shows through again. The result lasts longer when staining foods, tobacco, and plaque are controlled.
What is the direct answer?
What does this question mean?
A dentist applies a peroxide-based gel that breaks down coloured molecules within enamel and dentine. It changes the colour of natural teeth, not fillings, crowns, veneers, or dentures, so existing restorations may need separate planning.
What can you do next?
Have the dentist check for decay, leaking fillings, gum inflammation, cracks, and sensitivity before bleaching. Follow the prescribed gel concentration and wear time, clean between teeth, and limit frequent exposure to strongly coloured foods and drinks after treatment.
When should you seek dental care?
Seek dental advice if sensitivity is strong, lasts after the treatment period, or occurs in one tooth only. A dark single tooth, pain, or uneven colour can indicate trauma, decay, a restoration, or internal staining that bleaching alone will not correct.
What should you ask the dentist?
Ask whether your discoloration is on the surface or inside the tooth, what shade change is realistic, and how restorations will match. Ask about the gel, expected sensitivity, touch-up planning, and alternatives for one dark tooth.
Frequently asked questions
Can professional bleaching whiten a crown?
No. A crown keeps its manufactured shade, so matching it may require restorative treatment planning.
Why do teeth become darker again?
New dietary pigments, tobacco exposure, plaque, and natural colour showing through can change the shade over time.