My related experience was, in summary, when I got off of budesonide (a corticosteroid like prednisone) I started having horrible tooth pain.
I've got many, very, very old amalgam fillings, and it seems that those are what hurt the most.
To control flares, I was handed some samples ... 24 pills, 9mg delayed release budesonide pills (brand: Uceris) before I went on a trip. You take these 1 per day (whereas you take 3, 3mg non delayed release budesonide).
I took 12 pills, 12 days in a row while travelling because I was having symptoms (9mg/day). I stopped taking them for 10 days, but symptoms came screaming back! I mail ordered more medicine, but it was not scheduled to arrive soon enough, so I designed my own taper: 6 pills in 6 days (that was as prescribed), but after that, I took 1/4 pill, twice a day for 12 days (4.5mg/day).
So I took 2.25mg in the morning and 2.25mg in the afternoon on my taper. But the point of all of this was that I had to split a delayed release pill that included instructions to never crush, chew, split, etc.
This meant I could have had more of the drug come in contact with the inside of my mouth, and that could have caused the tooth pain to be worse...I don't know. I take my 5-ASA, fish oil, and anything else in a handfull that I toss into my mouth. I make no attempt to limit contact with my mouth. So in the case of my 12 day taper, taking 1/4 Uceris pill, twice a day, there was plenty of opportunity to have budesonide contact my teeth and gums. At the time, I had no reason to treat that split pill differently since I didn't read tooth sensitivity in the FDA instructions, and the sensitivity didn't show up until after I stopped taking the drug.
Anyway, it has been 5 days since I stopped and I still have pain. It seems to be getting better, though. I am taking acetaminophen, and that helps. I just hope it goes away completely.