Hi Em,
Yes there's definitely a relationship between Tmjd and tooth sensitivity. With people who grind or clench their teeth alot, this can affect the tooth structure . I'm not exactly sure how it works, whether it's due to the nerves in your teeth being compressed by the bite force, or the dentin being exposed, as your teeth are worn away,but somehow this causes the sensitivity.
In my case I had tooth sensitivity improved for some of my teeth by my dentist apply a desensitizing agent to them. For teeth that were more sensitive, a 'bonding agent' was needed to do the trick. But if the teeth are continuing to contact hard, the problem may perpetuate.
God bless,
John