A filling fixes a hole, or cavity, in the hard outer layers of a tooth. Cavities are caused by tooth decay
The crown may be made of material that matches the teeth, or it may be made of gold or another material.
A bridge replaces a missing tooth. It's usually made up of the replacement tooth and a crown on each side.
A partial denture replaces more than one tooth in a row. The replacement teeth are held in place by wires attached to existing teeth