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Dental tooth decay is more prevalent on the biting surfaces of the posterior teeth. While proper oral hygiene is essential to prevent decay, at times the anatomy of the tooth is such that it is impossible to clean properly. Dental caries are caused by plaque, a sticky film of bacteria that occurs on all teeth. When food is eaten, these bacteria eat the food and produce acid, which destroys the tooth. While good oral hygiene does not let food remain in the mouth, it is impossible to clean the pits, fissures and grooves of the teeth. These areas can be protected by the application of dental sealants.