This is a survey I have done while leeching their WiFi and drinking their free refills of coffee..I noticed 3 out of 10 were missing a majority of their teeth also..
I went into a McDonald's in another city this summer while traveling with a friend and it was filled with homeless people. Plus one creepy dude who kept blowing his nose on his shirt. My friend went to the bathroom and then came running back saying "can we leave? The floor is covered in needles in there."
i think that's actually below the national average. i can't believe how many people don't have teeth anymore.