If you had cracked your teeth like that then why the hell didn't you see someone right away?

Also did you keep the "pebble"? I'm wondering if it was actually a pebble (as there really shouldn't be a way for a pebble to find its way into your chicken) or if it was a piece of bone. If it was a pebble and this has happened with other people then perhaps a health inspection may be in order. It may not help you but if a pebble managed to get in their chicken then their food handling is not up to par.