elementary questions..but difficult for me!

I think that sentence is fine.

I think "we use our mouth to eat" would be one of the following:
Taberu no ni kuchi wo tsukau.
Taberu tame ni kuchi wo tsukau.
I think that these might be a little strange. How about just "Kuchi de tabemasu" ? 😌
 
I agree with Jimmy, it is a little strange!

How about these, which I got by changing Jimmy's suggestions ever so slightly:

Kuchi ha taberu no ni tsukau.
Kuchi ha taberu tame ni tsukau.

It seems a little closer to the original sentence to say it in this way to me for some reason.
 
Well, it's a strange sentence to begin with. "Kuchi de tabemasu." would be closer in meaning to "We eat with our mouths."
Yes, that's what I mean. I'm not sure a strange translation is the answer to an odd original sentence.
 
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