A rubber dam is a thin, flexible sheet placed around the tooth or teeth being treated. It separates the working area from saliva and the rest of the mouth. You will usually see a small frame and a sheet with an opening through which the tooth remains accessible.
Why keep saliva away?
During root canal treatment, reducing contamination from bacteria in the mouth is important. For bonded restorations, isolation helps provide the conditions needed for the material to attach to the tooth. The sheet also helps protect against contact with small instruments and treatment solutions.
How is it fitted?
The sheet is positioned around the tooth and may be held with a clamp. It is not permanently attached and is removed afterwards. Tell the dentist if you feel pressure, discomfort or need a break. Agreeing on a hand signal before treatment can make this easier.
What should you mention beforehand?
Tell the team about a latex allergy, as latex free materials are available. Also mention difficulty breathing through your nose or a strong gag reflex. These details help the dentist prepare and explain what to expect.
A rubber dam is part of protecting and organising the treatment area. It does not replace local anaesthesia, and using one does not by itself mean that your treatment is unusually complicated. You can ask to see the sheet before the procedure begins.