A 4-year-old child with an underbite often loses their orthodontic appliance. What should be done?

Patient's question:

Sure, here is the translation of the content you provided:
No

Doctor's answer:

Your child has a milk tooth crossbite and can only wear an active appliance, so it does not involve steel braces or ceramic braces. The cost is around 1,500-2,000 yuan, and it takes several months to half a year.