It's amazing how polymer scientists come up with ways to use plastic. Take plastic microbeads. Typically made from PE or PP, the beads are extremely tiny—about the size of a grain of sand—and have been found to be useful in cosmetic face scrubs and toothpaste.
But it also seems that there's a problem. You know how it is—along with the positive, there's bound to be a negative somewhere. Several articles in major media outlets published about a year ago told of how dentists were finding tiny blue beads underneath the gums of their patients during teeth cleaning procedures. It turns out that these little blue beads were plastic microbeads being put into toothpaste to help scrub teeth cleaner.