Researchers
recently developed a technique for polishing teeth with extremely fine silica
nanoparticles, which not only makes them shine, but also protects them from
cavities and rot. Silica particles have been used before, but when they are
this tiny, they have surprisingly positive effects.
The
particles are ground on the teeth, to make them take off a layer of the enamel.
This layer is less than one-billionth of a meter, and it would not be felt by
the patient. This removal of the top layer of enamel actually changes the
surface of the tooth.