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I've had plenty of dreams where something strange is happening, but losing a tooth is not one of them.
I take it you have? If that's the case, or maybe it's someone you know, how often does it happen? And have you looked into the significance of dreaming about losing a tooth?
Every dream has a meaning of some sort. I know it by experience. All that's happening in the dreams is in metaphorical form mostly. According to one of the books, that I have about decoding dreams, for this particular dream is said this:
"If you dream that your teeth shake or fall, it means bad news, failure, sickness and even the death of a close relative."
In my case I really had a problem with tooth (the same one from the dream), but luckily the dentist saved it...