That's a really difficult question - rather like choosing a car mechanic. You should always check that dentists do continuing education, that they have proper sterilisation procedures in place and that they wear loupes (special telescopic glasses). Next, are you comfortable as you can be at the practice and do you trust the dentist? Ultimately, professional relationships like Doctors and Dentists are always based on trust, which normally develops over a period of time. Sorry - that's the best answer we can give you, so beyond that...go with your gut instinct!