First, ifÂ  subject to or based upon your representation that you would have the procedure done, the dentist did buy certain supplies orÂ  materials for that procedure, then the dentist office could likely charge you for the actual cost of those materials, if they are not ones easily and readily used for other patients or other procedures.Second, as to whether you have a right to cancel the procedure and get your money back (less any amount for special ordered materials; see above), that depends on what was said in any documents, contracts, agreements, etc. you signed, as well as in any marketing or advertising materials associated with them and incorporated by reference into them. As a general matter, if you sign an agreement to have a procedure done, that probably does consitute a contract, even if it does not