Helps to remove plaque, control tartar buildup, and gently whiten for a clean, healthy-feeling mouth. Xylitol, a natural ingredient derived from birch trees, helps to remove plaque and prevent plaque buildup, while zinc citrate, a naturally occurring mineral, interferes with the calcification of plaque into tartar. The silica cleans and whitens teeth, removing stains without harsh abrasion that can damage enamel. (from Tom's of Maine)