I absolutely love Hern Family Dental Care, east side of Ypsi (maybe even so far as to not quite be in Ypsi anymore, but I'm not sure); they're great and friendly and very kind. Their number's 484-4710. 1747 E Michigan, it's a tan brick house on the left side, near Value World (I think).

This doesn't really answer the question, as I don't know what insurance plans he recognizes, but for those of us who don't have any health insurance, several friends have recommended a Doctor Kingston who I think has an office on North Washington Street. His rates are reasonable, but more importantly, he's apparently willing to offer alternatives- thus will let you know the cheapest way to solve a problem, as opposed to the most attractive (which is the only option most dentists give).