I believe that most baby teeth without roots, just fall out at about age 6 or 7. (In rare cases some baby teeth have roots, and are retained throughout adulthood, although.)
So, I would guess the best thing to do is just try to keep the teeth clean and follow what was suggested by the dentist. I read on the internet, that in some cases, cavities that haven't bore through too deeply will heal themselves if proper cleaning is applied.
Maybe since the dentist knew that these baby teeth are temporary, maybe that's why he or she wasn't too concerned about the cavities. That's just a guess, on my part.
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