Ind. Code § 25-14-4-2

Sec. 2. A person, firm, partnership, association or corporation, or agent or employee that engages in for profit any business or service that in whole or in part includes the referral or recommendation of persons to a dentist for any form of dental care or treatment must disclose to a prospective patient at the time the prospective patient makes the contact with the service that the licensed dentist has paid a fee for participation in the service.