At least two of my baby teeth broke as they came out or prior to coming out. My very last molar actually cracked in two and was in place for several months, because we were living in England and I refused to see an English dentist (I was 14 and had read too many horror stories). When we got home our usual dentist had to pull it, but the tooth under it was fine.
IN my case, my baby teeth had very strong roots that refused to dissolve. My upper four middle teeth had to be extracted because the new teeth came in behind them. One premolar that wasn't loose at all cracked in two and came out when I bit into a very stale school lunch taco in 7th grade.
As for my teeth? They're ridiculously healthy. I've had one cavity in my life - and that one re-mineralized several times before finally needing to be filled. I never needed braces, my teeth are strong and have plenty of room. My dentist was never concerned about my baby teeth breaking - he jsut commented about my very, very strong tooth enamel.
savithny, 42 year old moderate mom to DS Primo (age 12) and DD Secunda (age 9).