I'm 70 years old and recently broke off the top portion of a root
canal tooth with crown (Number 20).

My dentist smoothed off the remaining tooth structure, did a buildup
and inserted a post.  Then, put on a new crown.

I'm missing some back teeth, so I rely more than usual on tooth
Number 20 for chewing.

When I chew on that tooth, especially some harder or tougher to chew
foods, I often experience minor pain about 20 minutes after meals.  In
an hour or so, the minor pain usually subsides.  The tooth is not
sensitive to hot or cold or even chewing while in the process.  The
minor pain comes afterward.

My question:  Despite the tooth being root canaled, do there exist
pain receptors around the tooth or gums or ligaments or bone??
which can cause this minor reactive pain, and if so, is there anything
I can do about it short of extracting the tooth?

Thanks very much.

Rob in Arizona