Rubber dam is a square of flexible material, approximately 125mmx125mm that is placed over a single tooth or group of teeth to isolate it from the rest of the mouth.
The purpose of rubber dam is to prevent saliva or bacterial contamination of teeth that are being treated. It also prevents unwanted debris from being ingested by the patient.
An additional benefit is that saliva and blood from a patient’s mouth will not become aerosolised.
Rubber dam is always used in root canal treatment. It may also be used during normal restorative dentistry.