+0
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.
+0
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.
+0
>a world of hurt

I like that, GGEmotion: smile
Site Hint: Check out our list of pronunciation videos.
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.
Teachers: We supply a list of EFL job vacancies
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:-)