When gums recede, the roots of the teeth become exposed. The tooth root is not covered with enamel. The root surface is softer than enamel, and it is more susceptible to cavities. Many times, the roots are sensitive and patients avoid brushing these areas. Plaque accumulates, produces acids, and cavities result. If you have receding gums, you should talk to your dentist. Good oral hygiene and fluoride rinses can help prevent cavities in these areas.
Recession of the gums away from the teeth, combined with an increased incidence of periodontal (gum) disease, can expose tooth roots to plaque. Tooth roots are covered with cementum, a softer tissue than enamel. They are susceptible to decay and are more sensitive to touch and to hot and cold.
Your teeth are covered with enamel, which is one of the hardest surfaces on your body. In other words, it's a great protector for your teeth. When your gums recede, it exposes parts of your tooth (the roots) that don't have enamel over them. This leads to easier formation of cavities.
The roots are made of cementum, hard tissue that covers the dentin where the root canal resides; the crown has the enamel, hard tissue that covers the dentin. Unlike the enamel, the cementum is not built to resist the decaying effect of plaque, thus leading to cavities.
Receding gums expose the root of the tooth to decay. With the root exposed, plaque builds up and bacteria can easily spread to the inner part of the tooth. Cementum is a coating that covers the root, but when it is exposed the coating disintegrates. When cementum is no longer present, the softer region of the tooth, called dentin, can easily decay. Receding gums is one reason why older people are more inclined to cavities.
With food trapped the bacteria in the mouth can break down the food and produce an acid that will cause the cavities. Since the root is so much softer than the enamel the cavities are started easier.
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