Can somebody please tell me the point of 'guard rails' if the kid can still just roll off????

This little guy has been on my mind alot lately......his front teeth have a cavity developing and he seemed to be in quite a bit of pain last night but seemed fine today and has been sleeping well so far tonight (fingers crossed!!).....but he will not be able to get into the hospital for help for quite a while....so we are nervous for him.

But he adapts......he bites on the side, he lets me floss and brush still....remember what its like to have tooth pain?? Nothing worse because there is no escaping it.