Is it normal for a guinea pig's tooth to fall out?

I am babysitting my neighbor's guinea pig. Today i was holding it and i heard it chewing on something and it sounded hard. I open it's mouth and saw blood and i'm pretty sure it's to oth fell out and that's what it was chewing.Should I take it to they vet? HELP!
Answers:
Oh please, they do not fall out every two months!
You should definently read this guinea lynx entry before doing anything dramatic: http://www.guinealynx.com/teeth_broken.h...
So basically this explains that if the whole tooth broke out, root and all, you should take him to an experience small animal vet so that they can monitor it's progress and give you Critical Care. Critical Care is a mashed up pellet mix that can be fed with a syringe so that the guinea pig eats without his tooth. If only part of the tooth is gone, you should be okay. If it looks sharp, take him in to the vet.

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Most likely he broke his tooth off on something. Their teeth continually grow, so it should grow back if the root wasn't damaged. Make sure he continues to eat, as pigs are very sensitive to pain and this could put him off his feed. Make sure plenty of timothy hay is available. Also make sure the pig is getting an outside source of Vitamin C, very important for good tooth health.

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they fall out about once every 2 months they grow back don't worry

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Please listen to Gailtheguineapig. The person who said that teeth fall out every 2 months is totally wrong!!