Plaque build-up on your teeth causes most problems in the mouth. A bacterium in plaque produces acids that cause cavities and gum problems. If left untreated, plaque can lead to gum disease - a serious infection that damages bone and destroys the tissues surrounding the teeth.
Without a structure to hold your teeth in place, it is likely that they will eventually become loose and potentially fall out. This sounds dramatic, however, the chance of this happening decreases with regular and simple routine.