(1) Licensees shall report to the board instances of gross mistreatment and evidence of continual faulty treatment by other licensees. If the board determines that evidence of mistreatment exists, the patient should be informed of his or her present oral health status. Licensees shall not comment disparagingly about the services of other licensees; however, if they have reasonable cause to believe their concerns are well founded, they should address them to the board. Licensees may provide expert testimony in a judicial or administrative action so long as they are not paid a contingent fee.