To find a qualified dentist or a dentist who does good aesthetic / cosmetic dental work:
Check with dental schools, other dental specialists, and dental societies for referrals
Ask for alternative treatment plans in writing -- including the costs, benefits, and risks of each
Also ask about the life expectancy of the work and their guarantees.
Ask to see before and after photos of the dentist's clients -- make sure the work is the dentist's own work, and be sure to ask how much tooth-reduction will be needed for the procedure you're interested in.