Assuming you've already picked up some recommendations from your prior dentist or co-workers or from the American Dental Association website – www.ada.org – here are some points to consider in making your selection:
Go talk to the dentist. Does the dentist's schedule fit yours? Is the office convenient for you to visit? When you visited the office, was it clean and orderly? Does the dentist seem willing to talk to you about steps you can take to prevent problems? What arrangements does the dentist make for handling emergencies that fall outside regular hours? Is the dentist forthcoming about fees and amenable to payment plans for work? Importantly, is the dentist a member of the ADA? This is important because ADA members voluntarily agree to work by the high ethical standards set forth in the ADA Principles of Ethics and Code of Professional Conduct.
Don't be bashful about asking any other questions that come to mind. You and your dentist should be in a comfortable partnership to preserve your oral health.