Dental work on baby teeth

All in my family never required braces and we all have good teeth
(except for a small window of time that my mom was on welfare and had
no dental insurance, we all got a few fillings). My husband's family
all required braces, but none had the calcification problem that my
daughter has. So far, with a 9-y/o in braces whose baby teeth looked
perfect, a 7-y/o who definitely has crowding now who also had
perfectly straight baby teeth and will need braces, and a 19-mo-old
whose baby teeth already look crowded, I am thinking none of them were
lucky enough to get the teeth from my side of the family. lol. Anyway,
I just remembered that I have had all 3 dentists that I've seen
regarding the calcification issue tell me to definitely have her use
ACT fluoride children's rinse to help strengthen the weak spots, so
that is something you might try with any children old enough to not
swallow it - swish and spit. An adopted 9-y/o cousin of mine also has
the same issue as my daughter (so it is not hereditary), but he was
told to use the ACT also.