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
This direction of force can cause: 
Select and explain. 
A. Reduce overbite, B. Worsen open bite, C. Both, D. None
C: Both
Answer: C: Both 
Explanation: A labially directed force against a maxillary incisor (from a removable or fixed appliance) will tip the tooth and cause an apparent intrusion of the crown, which reduces the overbite (or makes anterior open bite worse).