My two lower root tooths are very sore. can you tell me the cause?

Depends : Soreness can be caused by many things from grinding & trauma from eating to tissue issues from lack of proper cleaning & low grade infections. I would have it evaluated if you are still concerned & if it does not subside after proper floss/brushing if area. Take 600mg ibuprofen every 6hrs for 24hrs (depending on med history & allergies) to see if it helps too.

No: Your symptoms are very vague. You better see your dentist for a definitive diagnosis.