Whitening strips bleach surface stains. They also penetrate tooth enamel and dentin to get rid of intrinsic stains from deep throughout the tooth. If not employed accurately, they may be dangerous to the teeth. Whitening toothpastes, for instance Opalescence, can lighten teeth by up to 2 shades in a month https://crowfootq036fuj6.eqnextwiki.com/user