Teeth Whitening Essence, Improve Yellow Teeth Clean Teeth Stains Tartar Plaque Beautify Teeth LiquidOur teeth whitening serum contains glycerin, panthenol and PCA sodium. It helps to whiten teeth and keep them healthy. Its use method is very simple: clean the mouth with warm water, dip a cotton swab into the appropriate amount of this product repeatedly wipe the tooth surface, rinse with warm water until the plaque is wiped clean. Whiten teeth after use, remove tooth stains, and let you regain the power of smile.