The undesirable side effect most commonly associated with the use of finger spring to tip the crown of a tooth is:
(A) Pain (B) Gingival irritation (C) Tendency for the root apex to move in the direction opposite from the crown (D) Tendency for the tooth to intrude
(C) Excessive forces can cause unwanted tooth movement. Unwanted excessive tipping of maxillary central incisor root is caused by over activation of finger spring.