About 10 years ago my upper left lateral incisor was removed. A bridge was made using the canine. About a month ago the area around the bridge started to be sensitive when touched by cold. The dentist removed the bridge and removed the nerve from the canine. I had no pain for two weeks, but then the tooth started to be sensitive to cold again. At my next visit I told the dentist about it and he placed a post. The tooth still reacts painfully to cold. Can you tell me why this is still happening and what the next step would be?
Kind regards,
Boštjan

Dear Sir/Madam!

Based on what you have written, I believe root canal treatment on the canine has been completed. It follows that the canine cannot be sensitive in the sense of sharp sensitivity to cold, heat, sweet or sour, in short to changes in temperature and osmotic pressure. This type of sensitivity is characteristic of vital teeth. The canine could hurt spontaneously, with a dull pain, or on touch. I think the sensitivity is coming from the neighboring tooth (the first premolar), most likely because of cervical dentin hypersensitivity.
Making a root post and a crown has no connection with pain in this or a neighboring tooth.

Have a nice day!