I Have Been Biting The Bottom Art Of My Lip

I have been biting the bottom art of my lip everytime i eat.. even if i chew slowly it keeps happening. I do have osteoporousis and have suffered bone loss in my gums... I was advised to get invisaline braces but my dental plan does not cover that and it is to expensive. My bite is so out of alignment that it is painful. What can i do?