<prompt> If during rubber dam application, you see the gingiva is protruding out of margins; what can be the cause for it?Holes on rubber dam placed too far from each otherHoles on rubber dam placed too close from each otherGingival tissue around holes are oedematousRubber dam is too thin  <response>: Holes punched too close together - holes pull away from teeth causing leakage.Holes punched too far apart- dam bunches up between teeth.Holes position too low on the dam - dam covers patients eyes or nose.Holes position too high on dam - dam does not extend over upper lip. 