There are different methods used to induce sleep dentistry. For example, if you require oral medications, you may be given a prescription ahead of time and instructed to take it about an hour before your appointment. Your dentist will discuss any other medications you take along with allergies to determine which medication is best for you. Nitrous oxide is a lighter level of sedation that is given during the procedure, and effects wear off quickly afterwards. General anesthesia is used for sleep, and instructions may be given to arrange transportation after your appointment, since the effects may linger.