I recommend you go to the Family Dental Clinic just off the Cring road, near the Petrol station/subway. They have pediatric, orthodontist, hygenists, dentists and do inplants and everything else you might want. The are American and are the oldest private dentists in Doha. I have been going to them for years. There number is 4666227.
Good luck
Aisha-Taweela