My 15 year old daughter is complaining about pain in her lower front teeth and chin.  800 Motrin does not seem to help and neither does ice or heat.  The dental X-ray shows nothing, a trip to the doctor where he felt around her jaw and looked in her mouth only shows possible tmj.  This has been going on for 48 hrs. And now she has a fever of 100 and slight swelling of lower lip.
Thanks for your query, I have gone through your query. The pain in the lower incisors and chin region can be because of the gum infection or tooth infection secondary to decay or trauma. Nothing to be panic, consult a good oral physician and get it evaluated. Meanwhile, take a course of antibiotics like amoxicillin. Continue Motrin 400 mg twice daily instead of 800 mg. Do not apply hot or cold things. I hope my answer will help you, take care.