Our teeth whitening serum contains glycerin, sorbitol, and hydrated silica. It works by counteracting discoloration to reduce yellowing or stains, restoring a brighter smile. It's also gentle on sensitive teeth and gums, and won't strip enamel or irritate gums. It's easy to use: simply apply 1-2 pumps of gel onto your toothbrush, gently brush from the inside out for 1-2 minutes, and rinse thoroughly with water. It naturally neutralizes yellowing in teeth, thus concealing stains, enhancing brightness, and freshening breath