What are the types of cavities?

What are the types of cavities?

Tooth decay can affect all layers of a tooth. It can take three years for a cavity to form in the strong outer layer of tooth enamel. Decay progresses more quickly through the dentin (middle layer) to pulp (innermost layer). Pulp contains a tooth’s nerve endings and blood supply. Types of tooth decay include:

• Smooth surface: This slow-growing cavity dissolves tooth enamel. You can prevent it — and sometimes reverse it — with proper brushing, flossing and dental cleanings. People in their 20s often develop this form of tooth decay between their teeth.
• Pit and fissure decay: Cavities form on the top part of the tooth’s chewing surface. Decay also can affect the front side of back teeth. Pit and fissure decay tends to start during the teenage years and progresses quickly.
• Root decay: Older adults who have receding gums are more prone to root decay. Gum recession exposes the tooth’s root to plaque and acid. Root decay is difficult to prevent and treat.