You should choose a certificate program if you want to gain certification in a particular specialization in order to practice it. However, if you're interested in research and designing your own research projects, you should choose a master's or doctoral degree program.

The American Dental Association lists many national organizations related to dental specialties. Many of these organizations administer certification exams that you can take after you graduate from one of these programs.

After completing a certificate or graduate degree program in orthodontics, you can take the certification exam given by the American Board of Orthodontics.