Teeth whitening results generally last from several months up to 3 years. The exact duration depends on the type of whitening treatment used, how well the aftercare routine is followed, and individual lifestyle habits such as smoking or consumption of staining foods and drinks (coffee, tea, red wine). Professional whitening treatments tend to last longer—typically 1 to 3 years—while at-home whitening products usually last 4 to 6 months with maintenance touch-ups. Smoking and frequent intake of staining substances can significantly shorten the longevity of teeth whitening results. Regular dental cleanings, good oral hygiene, and avoiding stain-causing foods and drinks help prolong the whiteness of teeth.