He explains that removing stains within the matrix in the tooth enamel is like having out dirt stuck in chicken wire: "What exactly comes about in whitening is we wish to... open up the matrix and bubble out that coloration, the stain, and afterwards close it again up." applicable condition https://realestatephotography52604.blog5star.com/22075472/a-simple-key-for-led-teeth-whitening-unveiled