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
Mouth breathing is an example of 
Select and explain. 
A. Compulsive habit, B. Non pressure habit, C. Meaningful habit, D. Useful habit
B: Non pressure habit
Answer: B: Non pressure habit 
Explanation: Non pressure habits are habits, which do not apply a direct force on the teeth or its supporting structure. Mouth breathing is an example of non pressure habit.