Search for 4's!!!

So I'm in need of class 4's!! I'm just crossing my fingers that 8 quads will come my way before school ends... which is sooo soon. I cant believe how fast this semester is flying by. My morning patient at the VA to day was a class 5 like usual but he told me his molars hurt when he bites down. The doctor came in and shined a light on the buccal surfaces of the molars and they all had fractures. It was really neat to see. If the light doesnt shine through the tooth then it means there is a fracture... I thought that was good to know and something we can do to see whats going on.