Tooth decay is also referred to as dental cavities or caries. It occurs when the bacteria in plaque is allowed to settle on teeth which produces an acid that slowly eats the tooth enamel and forms holes. This bacteria is general after eating sugars and starches, so preventions can be done by eating a healthy diet.
The likelihood of development of a cavity depends entirely on lifestyle. The better you follow oral health routine, the less chance you will have of suffering tooth decay. However, older people and children are slightly more at risk, because their enamel is more unprotected. If a child develops cavities within baby teeth, they will be repaired as soon as the adult teeth, but this does not mean that dental attention isn’t still required for them.