During my last 3 dives over 7 days in March, I had dental pain for about 4 hrs, starting about 5 hrs after each dive. My dentist said all appeared well, and options were an anti inflammatory medication before the dive or a root canal. The latter seems too much given the tooth is healthy by the dentist's assessment. I plan to take an ibuprofen as plan A if the pain returns when I dive again in January. The pain is a tooth in the middle of the lower jaw that has a deep filling, but one I had dove problem free with many times. Am I destined for a root canal, or have others had such pain dissappear from a seasonal break from diving?