What is a core build up? What are they going to do at the next appointment after the root canal? I am just worried because my tooth is sore and I am scared if they will work on my teeth while they are still sore, it will cause more pain? I really have no idea what this procedure is and am just wondering. How long does it usually take to do this as well? Thanks anyone who can help.

Oh and I was also wondering if a root canal will help me be able to eat cold and hot stuff on that side of my mouth again as well. I chipped a tooth and couldn't take anything cold or hot on that side of my mouth for the longest time. Thanks.