To make the new tooth or teeth, your dentist will make an impression of your existing teeth, creating a model of your bite. The new restoration, most typically a crown, will be based on this model so it will blend in perfectly with the rest of your teeth. The crown is then attached to the connector point (abutment) on your implant.
Replacing a lost tooth is essential to a healthy mouth and a healthy body. It will provide you with increased aesthetics of course, but will also improve your speech, ease of eating, and oral hygiene.