Crest Professional Effects: At-Home Teeth Whitening Kit Promises Up to 18 Levels of Whitening

Crest Professional Effects, an at-home teeth-whitening kit from Procter & Gamble Co., contains 40 strips designed for a complete course of whitening. The product promises to whiten natural teeth up to 18 levels in just 20 days with daily applications of 45 minutes each.

The kit includes 20 upper and lower strips, which are worn for 45 minutes per day over the course of 20 days. Crest's Advanced Seal Technology ensures a comfortable fit that doesn't require constant adjustments or repositioning.

The American Dental Association has approved Crest Professional Effects as safe and effective when used according to the manufacturer's instructions. This approval places it within the tooth-bleaching category, specifically for whitening natural teeth.