This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
The major disadvantage of treatment using a cervical head gear is 
Select and explain. 
A. Impaction of maxillary canines, B. Extrusion of maxillary incisors, C. Extrusion of maxillary molars, D. Deformity of neck
C: Extrusion of maxillary molars
Answer: C: Extrusion of maxillary molars 
Explanation: So cervical head gear is used in patients with low mandibular plane angle and deep bite.