Prehma Latex Rubber Dam 5 in x 5 in Medium Gauge Green 52/Box Protects patients from exposures during procedures. Avoids aspiration or ingestion. Maximum tear resistance. Specially designed for operative and endodontic procedures. Rubber Dam is used in operative and endodontic treatments to provide a working field . This durable rubber dam creates a barrier for patients to prevent any airborne harm from being inhaled, especially when using rotary tools.Rubber Dam is available in different sizes and thicknesses to suit dental needs.