Whitening strips bleach area stains. In addition they penetrate tooth enamel and dentin to eliminate intrinsic stains from deep throughout the tooth. If not used accurately, they are often damaging to the teeth. I often inform folks to ditch the light and acquire much more strips for the same cost. https://top-quality-teeth-whiteni93715.blogsidea.com/40238513/5-simple-techniques-for-teeth-whitening-product-manufacturers