Dentistry is the art and science of diagnosing, treating, and preventing diseases of the teeth, jaws, and surrounding tissues of the mouth. Dental treatment includes a wide range of dental services. Some of these services focus on correcting problems of the teeth caused chiefly by dental decay. Such treatment, called restoration, often involves the use of some kind of dental filling. Other dental services deal with the prevention and treatment of diseases of the teeth and their supporting tissues and nerves. Still others concentrate on the position of the teeth in relation to each other and to the jawbones. . Dentists may also treat injuries, infections, tumors, and various other conditions of the teeth, jawbones, and related tissues.
             A number of branches of dentistry have been established. They include general dentistry, orthodontics, oral surgery, periodontics, prosthodontics, oral pathology, pediatric dentistry, and endodontics.
             General dentistry involves all phases of dental practice. Much dental practice is concerned with the prevention of mouth diseases. Dentists teach patients techniques for cleaning teeth and establishing nutritious eating habits that help keep teeth and gums healthy. Dentists also may clean the patient's teeth and gums but usually specially trained dental hygienists help with these activities. General dental treatment includes filling cavities, extracting teeth, and replacing lost teeth with bridges or dentures.
             Orthodontics specializes in the correction and prevention of irregularities of the position of teeth. he majority of malocclusions occur because the teeth are too large for the amount of jaw space available. As a result, the teeth become crowded. These problems are corrected with braces or other mechanical devices that move the teeth into a better position or to correct facial profile irregularities..
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