A single implant replaces a single tooth root. Once it is placed under local anaesthetic by an oral surgeon, a crown is screwed into the top of it.
During the time the implants and jawbone heal after the implant surgery, the jawbone has a lightbulb moment, where it believes there is actually a real tooth root there again. It’s this healing process and acceptance of the implant by the jaw that make dental implants superior to any other tooth replacement treatment.