Our whitening strips contain glycerin and menthol. It helps to remove stains and whiten teeth. The way to use it is simple: first take out the tooth whitening sticker, apply the tooth whitening sticker below, and then apply the tooth whitening sticker above. Leave the whitening on your teeth for 30 minutes. Do not eat or drink during use. Tear off the tooth whitening stickers and throw them away. Gargle the remaining gel and enjoy the bright smile. Oxidize stains after use, brightening teeth.