Typically, to replace one single tooth with an implant there are multiple visits. The first visit is where the implant is placed into the bone. This is often done with some level of sedation. Sometimes if a tooth needs to be pulled and an implant placed, this can be done during the same visit.
Healing usually takes between 4-6 months with the implant under the gums. The next visit is an uncovering visit and putting a gum healing cap on. This is usually a short visit. After this heals(about 2 more weeks), we take an impression for the new implant crown. The final visit is to cement the final implant crown.