1Can remove the stains resulted from smoking and drinking tea in a effective way, make your teeth white and shiny. 2Effectively wipe off dental plague, whiten and brighten teeth, keep teeth clean. 3The brush hair on the top of the pen is soft, it will not hurt your teeth and gum, comfortable to use. 4Safe and mild ingredients, non-irritating, bring you good teeth whitening and cleaning experience. 5Light weight and in small size, simple pen shaped design, easy to store and carry.