A collection of devices intended to whiten natural teeth through bleaching. It typically includes a bleaching agent (e.g., a gel containing a low concentration of an oxidizing agent, such as carbamide peroxide or hydrogen peroxide), a syringe(s), a tray(s), a mouthguard, an applicator (e.g., a brush) and strips to apply/retain the bleaching agent to/on the teeth for a recommended period. This is a reusable device.