Before placing a filling, your dentist usually will numb the area around the tooth that needs to be filled so you won't feel any pain during the procedure.
Then, your dentist will use a drill or other tool to remove the decay inside your tooth, leaving an open hole. The area will be cleaned, and your dentist will use a filling material, which may be made from gold, amalgam (silver-colored filling material), tooth-colored plastic or other materials.
Finally, your dentist will smooth down the tooth to make the filling is less noticeable. If the filling was made from a tooth-colored material, you will barely notice it.