Try an appropriate dose of acetaminophen or ibuprofen prior to bedtime and see if that helps. It's perfectly fine to comfort him, but try to keep him in his bed. Although it may be difficult, try not to change his bedtime routine and avoid bringing him into your bed when you're rocking him back to sleep or feeding him. The teething should pass in about a week, and you don't want him to continue waking up for this new, fun routine. Once the teething comes to an end, he should again sleep through the night as he previously did -- and so will you.

If he seems excessively irritable or if the symptoms persist, make an appointment with your pediatrician to rule out any other cause of pain or illness. Sometimes an ear infection, sore throat or sores in the mouth may cause mouth pain, even without a fever or other signs of a cold.