An orthodontist is a dentist who works on a wide variety of oral health issues. Areas of focus include the mouth, gums, teeth, jaw, and nerves. Orthodontist deals with the certain types of dental problems like prevention, diagnoses of overcrowded mouths, overbites, occlusions and correction of malpositioned jaws and teeth. They help to improve the ability or appearance of the person to swallow and chew food without difficulty or pain. They also deal with other conditions such as speech impediments, jaw pain, gum disease, sleep apnea, and difficulty chewing.