Well, salary depends on the contract you will get from the clinics/polyclinics. Are you here now in Qatar? To work as a dentist, you have to pass the Licensure exam being given by Qatar's Ministry of Health. Otherwise, you will end up working either as an assistant or a hygienist. Bring all your authenticated documents to the ministry for evaluation to be able to sit for the written and oral exam. Check www.nha.org.qa for more info. Goodluck.