215 ILCS 110/24

The Director may revoke or amend, after reasonable notice and hearing, any charter, certificate, order, authority or consent made by him to a dental service plan corporation on being satisfied (1) that the further solicitation of subscribers or further continuance of the practices in question will work a fraud on subscribers, (2) that the rates charged or the benefits provided are not fair and reasonable to both the subscriber and the corporation. The Director after reasonable notice and hearing may also cancel the authority of the corporation to transact business in any particular geographic area if he finds that less than a majority of the eligible licensed dentists practicing in that geographic area are participating dentists.