Your thinking is right. After the age of 7 years there will be mixed dentition(milk as well as permanent).
You need to care of that black caries otherwise it spread in to permenat also.
Permenat which erupts in mouth with decideous is at risk.
Permenant which below that carious teeth is at lowest risk.
His permanent teeth , incisors should erupting between 6-7 yrs.If not troubling otherwise you can leave your milk teeth.Till the permanent teeth erupts.
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