I think the reason dentist's still fill a baby tooth and try to save them is to wait a little longer until they see that the permanent tooth is in position to come in, thus saving the space. If the baby tooth comes out too soon, it causes the teeth to shift and sometimes the regular teeth come in crooked. If the dentist does deem that a baby tooth must come out, it is best that they do it, that way, they often place what is called a "spacer" in where the tooth came out, thus saving that space open so that the regular permanent tooth will be come into that open space in the correct spot and not come in crooked. I hope this helps you understand more. My parents used to jerk my baby teeth out with string and a door handle being slammed shut or just pull the tooth themselves or have me wiggle it free thus I ended up with crooked teeth. Now with my own grandchildren, whom I am raising, I see and hear what their dentist is doing much differently. My 13 year old has had these "spacers" placed and his teeth are perfectly straight now, without ever having to had braces later, etc. Good Luck!
