Most whitening treatments last 6-24 months. The variables that shorten that window are diet (coffee, tea, wine, tobacco), hygiene consistency, and the type of treatment.
Professional in-office and take-home trays tend to hold longest — up to 2 years with maintenance. Strips and LED kits typically hold 6-12 months. Whitening toothpaste effects fade within weeks of stopping.
A short refresh course every 6-12 months keeps most home routines looking consistent.
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