When my DD was about 4, she fell flat on her face during dance class and knocked one of the front top babyteeth out of place (kind of sideways and at a funny angle). I rushed her to the regular dentist who suggested pulling it. I decided to get another opinion and took her to the pediatric dentist instead. The pediatric dentist said, lets not do anything, and wait and see what happens.... so by the time we went back for her next regular appointment, it had tightened back up and was healthy, though crooked.
The pediatric dentist said that it could have gone either way, we got lucky.