A dentist is a doctor that cares for teeth and gums. Dentists identify symptoms of potential and current problems in oral health, and take steps to intervene. Because the knowledge and practice required for becoming a dentist is so involved, the training requires a four-year doctorate program in a dental school, beyond a four-year bachelor's degree. Usually, in order to be successful in a dental school, one should seek an undergraduate major in biology or related life science. If you plan to obtain your own practice instead of working in a partnership, you should be prepared to handle business tasks and other leadership roles.