... and concha hallotidis.Function: It can oxidate yellow and black tooth caused by smoking, tea, coffee, red wine, areca ... catechu, food color, tetracycline pigmentation teeth to make tooth become white and shiny, At the same time, ... Usage:Scatter this powder on toothbrush or toothpaste when brush tooth. 1-2 times a day.Precaution:1. Pls ... should use cautiously.Expiry Date: 3 years tooth whitening products