It took quite a while for Shaun to start loosing teeth. He was well into the first grade before he lost the first one and second. It was at the end of second grade before he lost the next couple. He is currently missing 4 teeth and has a couple more loose getting ready to come out.
Loosing this many at one time makes sense since he had 7 teeth come in within 2 months just after his first birthday. They all came in together so falling out together doesn't seem out of the question.
I keep teasing him that if he looses any more he will only be able to eat yogurt and soup. His reply "And ICE CREAM!!!"