Product description professional teeth whitening kit mouth tray gel strips white tooth bleach kit dental bleaching system teeth whitening gel 1.main ingredients: 35% h2o2 mixed gel 2.indications: suitable for exogenous coloration of human teeth, dental fluorosis, tetracycline teeth, etc. 3.mechanism of action: a gel containing hydrogen peroxide, applied to the surface of teeth that have been cleaned, h2o2 is decomposed into active oxygen (o2) under the irradiation of strong blue light, and multiple reactive oxygen molecules are combined into an oxygen group, passing through the teeth. product use precautions: 1. a small number of patients may have a temporary soreness during whitening or whitening. this is a normal phenomenon; if the soreness is strongly unbearable, please pause or stop the whitening operation, and then continue.