Some tips for finding a dental specialist include getting referrals from your friends and family and asking your family doctor to suggest good specialist dentists they may know. Referrals from friends and family are usually based on personal experience with a particular specialist dentist.
Asking your family doctor for a recommendation is more helpful, as he may know skilled specialists from the medical circles. Since your family doctor knows your medical history well, he likely is qualified to recommend a suitable specialist dentist.
If you are moving to a new area, you can ask your current specialist dentist to make a recommendation for you in case he knows a specialist based in your new location. Another helpful tip is to contact your local dental society and ask for assistance or recommendations.