Tooth pain after a filling is placed happens for a few reasons.
Most often it can be easily resolved.
This question from Kristen in Cincinnati shows how frustrating it can be when a tooth that never hurt before becomes sensitive after having dental work.
More about problems with fillings here.
Hi Kristen, Sorry to hear about your fillings..that really stinks! But you are definitely not out of luck!
Fillings are sensitive for a few reasons...
It sounds like your dentist did all the right things...took an X Ray to check for an abscess, adjusted the size so it is not too high and checked for a crack in the tooth by having you bite on a crack finder (the stick).
Grooves in your teeth should not cause sensitivity to chewing hard foods.
I know 6 months seems like a long time but some teeth take a very long time to quit being sensitive after a filling. It is too bad that you had all four molars done at once and that all four of them got sensitive. That makes it really hard to avoid using them.
Sometimes it take more than one bite adjustment. I would have that checked again. A filling that is even very slightly high (too big) will stay sensitive.
Or it may just take more time.
Since the next step for teeth that don't recover from a deep filling is having a root canal and crown, most decide to wait for the sensitivity to slowly but surely improve on it's own.
If you are noticing gradual improvement, that is a good sign. If the sensitivity is increasing in frequency or severity, you should talk to your dentist about further treatment.
For your peace of mind, a second opinion wouldn't hurt to be sure the fillings are good and there are no obvious problems.
Sensodyne toothpaste will not help with sensitivity due to fillings. It does help teeth that are sensitive due to a receding gum line.
You can read more about the causes of tooth filling pain here.
Thanks for writing and hang in there it will get better:)