I agree with brad. A bad shed isnt all that bad but if you get several bad sheds in a row then you need to up your humidity. My snake has swallowed some reptibark and that aspen bedding and has had no ill effects. Maybe it adds a little fiber in thier diet, just kidding. Dont rub the head too much because this will stress out the animal greatly. I have had baby ball pythons have incomplete sheds but they usually get all the pieces off in a few days. It seems to me that they older they get the more experienced they become. A soaking a week never hurts it removes loose debris from thier scales and helps them get rehydrated.