A) Right on!
B) Oh yeah. What happens when there’s a “chilukei deyos”. Some dentists who “study the need for brushing teeth and other dental medicine and hygiene” say to do it one way, and other dentists who “study the need for brushing teeth and other dental medicine and hygiene” say to do it another way. Divrei mi shomim? Who do you follow?
C) Who is “Yeshiva”. Person place or thing? A Rebbie teaches hebrew subjects, secular department secular subjects. Some things are left to the parents. How to master a toothbrush is not beyond the capabilities of parents. I think. (did they teach me in school how to get dressed? I forgot)