WTF?

I chipped a tooth! How does that happen? I was eating toast and a peach with some Grape Nuts for breakfast. Now, the Grape Nuts aren't soft, but they definately soften up when mixed with milk- as they were this AM. So how on earth does a tooth chip in that situation?
Thank God it's only a tiny chip- but a chip nonetheless!! What do I do? Anything? Is there anything TO do?