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Dear Teachers,

1. If you dare touch any of her hair again, I will break all of your teeth so that you can not eat rice anymore.

- Is this natural to say?

Thanks very much to Teachers,

Stevenukd.
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Well, Stevenukd, I'm not sure that many people would consider the message in your sentence natural or desirable, but grammatically it's OK. Emotion: surprise

PS
We usually spell 'cannot' as one word.
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>a world of hurt

I like that, GGEmotion: smile
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Comments  
Here is perhaps a more normal sounding rewrite:

If you so much as dare to touch a single hair on her head, I will inflict a world of hurt upon you.

("I will break your teeth" just sounds odd, and "so that you cannot eat rice anymore" just sounds like a silly addition.)
 Marius Hancu's reply was promoted to an answer.
Students: We have free audio pronunciation exercises.
I like the line from Pulp Fiction even better: I'm going to get medieval on your ***

<typo fixed>
Yes, that too ... get medieval on (you typed too fast:-)