How common is having a dental cavity?

It depends : Much depends on where you live, if you drink from a water supply that has fluoride, if your brush with Fluoride toothpaste, your genetic, and dietary factors.

Very common: Dental cavities are very common. They are caused by bacteria in the mouth which collects on the teeth in the form of plaque. If the plaque is not removed daily the plaque gives off acid which eats away at the enamel of the tooth resulting in a cavity. If not treated early the cavity continues to destroy healthy tooth structure.

Very common: Dental decay is one of the most common diseases among human beings and also one of the most preventable! proper personal hygiene, timely professional care with early detection and the correct diet are part of the solution. Unfortunately, ignorance, fear, poverty, and misplaced priorities have allowed dental decay to be at epidemic proportions!