The time period of the cosmetic dental procedure varies with the type of cosmetic procedure you are taking and with the severity of the procedure. Some dental procedures just require one visit, and some require multiple visits after a specified period of time. If we talk about teeth whitening and dental bonding, it only takes 30 minutes to two hours and is considered one of the quickest procedures. However, porcelain veneers require one to two weeks, and Invisalign takes a few months; even so, it is a long procedure. Also, full mouth restoration is a long procedure requiring at least a month.