S.T.
I think you need to talk to the daycare about their lack of supervision leading to your son's fall and then your disappointment in the fact that they weren't upfront with you about his injuries. However, there is nothing you can do to a chipped baby tooth! I know how upsetting it is to have this obvious imperfection, my son chipped his top right front tooth when he was learning to walk! He fell forward on our driveway and chipped it! Anyway, I asked like 5 different dentists about it and they all said you just have to wait for the adult teeth. My son is 5.5yrs old and everytime I look at his chipped tooth I think of that fall! I know he doesn't even realize he has a chipped tooth but as mommy it bothers me quite a bit!
Hope you can work things out with daycare!