Answer:
What dentists battle on a daily basis
This is your stomach's way of letting you know you've neglected it.
Long and thin, red within, with a nail at the end.
Why is 6 afraid of 7?
I'm often served as a "rack of ..." I'm often smoked or grilled, with bones in, and slathered in BBQ sauce.
What goes up the hill and down the hill, And spite of all, yet stand still?