Jacket
Crown for a front tooth, usually made of porcelain.

Laminate
Thin plastic or porcelain veneer produced in a dental laboratory and then bonded to a tooth.

Laughing Gas
Nitrous oxide; odorless inhalation agent that produces relative analgesic (sedation); reduces anxiety and creates a state of relaxation.

Lesion
Injury of bodily tissue due to infection, trauma or neoplasm.

Local Anesthesia
Partial or complete elimination of pain sensation, in the immediate vicinity
of its application or injection.