I have been on Letrozole for 8 months now. In May I had issues similar to what you have described. A dull ache in one tooth then it seemed to move along the jawline and even to other side. When first happened I was in fear that I needed a root canal (I have real anxiety issues with dentists!) and I did make an appointment for a long overdue check up. Of course in the intervening week the condition changed and as it moved I felt a little more comfortable that it might just be a form of neuralgia. I medicated with Panadol and ibuprofen which did take the edge off. Probably lasted for a good week. Had the dental check up and all was good. Has been fine since. Was it the Letrozole? Who knows! Haven’t been back to my oncologist in the intervening period and didn’t think worth a call. 🤞that it was a ‘one off’.