YOU SAID:

If my mouth doesn’t say it my face definitely will

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私の口がそれを言わなければ私の顔は間違いなくそうするでしょう

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If my mouth doesn't say that my face will definitely do so

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私の口が私の顔が間違いなくそうするだろうと言っていないなら

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If my mouth doesn't say my face will definitely do

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私の口が私の顔が間違いなくするだろうと言わなければ

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Unless my mouth says my face will definitely

INTO JAPANESE

私の口が私の顔が間違いなくそうだと言わない限り

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Unless my mouth says my face is definitely so

INTO JAPANESE

私の口が私の顔が間違いなくそうだと言わない限り

BACK INTO ENGLISH

Unless my mouth says my face is definitely so