Hi zimm,
Sounds like a barodontalgia. While the most common cause is the maxillary sinuses and their proximity to the upper molar teeth, if you have had recent dental treatment and a fracture was actually seen during the time of treatment, there is a good possiblity that the tooth and/or the nerve is the problem.
Most any tooth can get sensitive to cold following a filling. With some of the newer tooth colored fillings, sensitivity to cold and pressure persisting up to 6 weeks may occur.
Since your pain is on ascent, this makes me more suspicious of an irreversible pulpitis and may make a root canal necessary.
Check the DAN article on the Scubadoc site:
http://scuba-doc.com/RarestBT.html
I authored the article and it contains a table which categorizes the different types of barodontalgias.
My own experience in treating these is that once the tooth becomes symptomatic, a root can will USUALLY become necessary. Failure to do so may result in a dive you will never forget!
Hope you get better soon.
Larry Stein
:doctor:
Disclaimer
(No representations are made that in any way offer a diagnosis, treatment or cure for any illness or condition, either discussed or implied. Answers to questions are offered as information only and should always be used in conjunction with advice from your personal diving physician/dentist. I take no responsibility for any conceivable consequence, which might be related to any visit to this site.)