Mich. Comp. Laws § 550.362

Sec. 12. A dental care corporation before entering into a contract with an applicant or group of applicants for dental services may require: (a) A physical examination of the applicant and each of his dependents and proof of their substantial freedom from any disease or condition requiring immediate dental service. (b) A reasonable waiting period after a contract is entered into before the subscriber is entitled to dental service. (c) Payment by or for the subscriber of the stated fee for dental services for the care of any given illness, injury or other condition requiring dental service.