A post is planted in the jaw bone to support a replacement tooth. This acts like the root of a natural tooth. Implants can also be used to support fixed bridges or dentures.
Implant treatment normally has two stages. First, the implant is placed in the jaw. Then, when the jaw has healed, replacement teeth are attached to the implant. In some situations it is possible for temporary teeth to be attached to an implant at the time of fitting.
If you decide to go ahead, this is what will happen.
Implants usually have two sections - the post in the jaw and an extension that is added later when the post is secure. Attaching the extension needs a small cut in the gum above the implant. You might have more than one implant. The replacement teeth might be fixed permanently (like a crown or bridge) or attached in a way which lets you remove them for cleaning (like a denture).