What part of the human body is largely unable to repair itself?

Skin is able to repair itself and bones can readily fix themselves; in fact, most body parts are able to repair themselves over some period of time, but teeth don’t. “Cells are what start the healing process in our bodies, and as tooth enamel consists of 90 percent minerals, there aren’t many proteins and cells there,” explains Janne Reseland, a professor of biomaterials at the University of Oslo (UiO). She explains that at the base of the roots of our teeth we have cells that can provide a certain amount of repair, but not up in the crowns. This leaves a large section of teeth’s surface area highly sensitive to the environment – what we breathe and what we eat and drink. In short, the difference is that teeth don’t have the same cells that bone does, and as a result, they have a very limited ability to repair themselves.

Source: Tri City Dental Care