I don't know what, if any, link there may be between the dental issues being discussed and ibs, but there is definitely a correlation between tmj problems (jaw problems) and ibs.
I'm not sure if it's a coincidence or not, but I started having terrible jaw pain within months of my ibs becoming more severe [I had ibs well prior to this, but up until then had never gone to a doctor specifically for my gut issues]. In my case, the tmj problems are the result of many years of tooth grinding, to where it actually caused damage. But my ibs issues could still be linked to it somehow.
Otherwise, the only dental issue I have is mild-to-moderate periodontal disease [but it is well managed and not a serious issue at this point]. Apparently, long term tooth grinding is linked to periodontal disease.