12. A hearing-aid acoustician shall not, with respect to the practice of his profession, designate himself as other than a hearing-aid acoustician.
He shall not be authorized to call himself a specialist or to indicate a specialty or particular training. Nor shall he assume the title of doctor or use an abbreviation of that title, unless he is a physician or dentist; however, if he holds a doctorate in a particular discipline, he may add the title of doctor to his name, with a mention of such discipline.