3.08.02.The fees are fair and reasonable if they correspond to the services rendered and are warranted by the circumstances. In determining his fees, the dentist must in particular take the following factors into account:
(a) the time given to the carrying out of the professional service;
(b) the complexity and extent of the service;
(c) the performance of unusual services or services requiring exceptional competence or speed;
(d) the amount of any disbursements and expenses incurred by him.