I have found the dental discount plans to be very good (don’t fall for the medical discount plans, though, because most are scams). Plans will start at about $80 per year. They have a set fee schedule so you know what you are paying up front. There is no deductible, no waiting period and no yearly maximums. You can compare over 30 plans here http://www.dpbrokers.com/default.aspx?locationid=20349 and can look up your dentist to see if he is in the plan.

Generally, private policies cost more on a monthly basis than they pay out - with exclusions, copays and deductibles, you’re usually better off paying out of pocket.