Officially 1 kind: An Orthodontist is a Dentist who has completed at least 5,000 hours of additional training, beyond Dental School, in an approved residency program, in all phases of Orthodontic Care, who has passed all the requisite tests, and who limits his/her practice to just the Specialty of Orthodontics. There are many non-Orthodontists who provide Orthodontic Care, but not with the same level of expertise.
Answered 11/20/2014
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