1.   Some foods can stain the teeth, as of course can smoking.

2.   Coffee also can stain developing teeth.

3.   His teeth were stained, probably from tobacco, and he suffered from malnutrition, although it probably was not the cause of his death.

4.   However, for children whose teeth were stained by tetracycline, treatment periods of up to six months may be needed to remove the discoloration.

5.   It will stain the teeth when eaten.

6.   Some people are exposed to metals that can stain teeth.

7.   Alam, whose remaining teeth are stained from chewing betel nut, said the land was just enough to build a house but was insufficient for fruit trees.