Tooth or jaw pain? If the pain is discomfort associated with tooth movement, then tylenol (acetaminophen) or advil will alleviate the discomfort. Although many dental profesionals claim advil to be more effective than tylenol (acetaminophen), research suggests that ibuprofen(advil) interferes with tooth movement (slows) while tylenol (acetaminophen) does not demonstrate such an effect. If the pain is jaw related, inform your doctor.
Pain? There should not be much pain involved. I would see your orthodontist and discuss. You may need tray revisions.