| http://www.w3.org/ns/prov#value | - The ADA describes four categories of tooth whitening/bleaching treatment methods: professionally applied (in the dental office); dentist-prescribed/dispensed (patient home-use); consumer-purchased/over-the-counter (applied by patients); and other non-dental options such as treatments or kits sold in non-dental retail settings, such as mall kiosks, salons, spas, and cruise ships.1
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