There are many kinds of dental implants. Dentists can use dental implants to replace a single tooth, multiple teeth, or an entire mouthful of teeth. With All-on-4 dental implants, the dentist will implant four screws for your top teeth, and four screws for your bottom teeth. An entire set of teeth will be implanted using the screws that rest in your jawbone. Once those have healed, a dentist will then place your implants.