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 best time to treat a cross-bite is: 
Select and explain. 
A. When the roots are fully developed, B. When the roots are 2/3rd developed, C. Permanent dentition has completely erupted, D. As and when detected
D: As and when detected
Answer: D: As and when detected 
Explanation: None