Write an article based on this summary:

Research licensing requirements in your area. Apply for your dental and/or orthodontic license. Take and pass your licensing exam. Consider getting board-certified.
The requirements to practice as an orthodontist varies from state to state. Most states only ask you to get a dental license, which allows you to practice general dentistry or a specialty, like orthodontics. But some states, like Michigan, Oregon, and Idaho, require both a dental license and an orthodontic license.  Contact your state's dental board to find out which license(s) you need before you can begin your practice.  Find out what you need to qualify for a license. In most cases, you will need dental school transcripts, a passing score from a national or regional dental board exam, and completion of an orthodontic residency. Depending on where you live, the application fee can be anywhere from $300-$600. You will also have to submit to a background check and drug testing. Even though you've already passed your DAT and NBDE, you still have to prove to the state that you meet their standards before you can practice. The exam varies from state to state. Contact your state dental board for information on the test's content and structure, and for guides to help you prepare.  Once you pass the licensing exam, you can legally practice as an orthodontist in the state. If you move to a different state, you will have to repeat the licensing process. Some states will exempt you from the licensing exam if you passed it in another state, though. You don't have to be certified by the American Board of Orthodontics to practice — in fact, only about 1% of orthodontists are. However, getting certified can set you apart from other orthodontists in your area because it shows that you have passed yet another bar of excellence.  You will have to take and pass an exam of 240 written questions, as well as a clinical exam. Certification expires every ten years. You must take and pass a renewal exam every decade to prove you are still able to practice at a high standard.