Preventing Teeth Stains
Tooth enamel, the outer whitish layer covering teeth, wears away as we age; underneath the enamel is dentin that is more yellowish. So as you age, eating foods and drinking fluids that attack and discolor or stain enamel (see following slides) may cause dentin to be exposed. By eating and drinking non-staining foods and fluids and by using whiteners carefully, whitening treatment may last about a year. However, people can overdo whitening. Using whiteners too much, too often, or that are too concentrated can cause teeth to look translucent with a resulting bluish or blue-gray coloration.