Questions am reluctant to answer
When does child start braces? Is one of them
There is no cookbook all depends on what's on individual patient. I have delayed treatment on most kids below 10 years but same time started treatment below 8 years like case below. Say name is little Jonny 5.5 years old ...the front teeth will not grow cause lower front teeth have overgrown and now preventing the upper front from coming through.
This is time for little Jonny to start treatment so that the orthodontist can guide developing teeth. Unerupted teeth in growing child affect bone growth negatively as here and may result in an underbite