It is recommended that you do not eat or drink anything (except water) at least 5 hours before your scheduled appointment. This will prevent food debris from accumulating on your teeth, which can irritate you during cleaning and cause the dentist to have to work a little harder. First of all, make sure you have all the right information. Some offices have text message and email systems, but you must still call the office 24 hours in advance to confirm this.
Whether you haven't been to the dentist in 5 years or you've never been to the dentist, it's a good time to schedule that appointment.