The word mouth is emphasized in Proverbs. Of the 294 times it is used in the OT, 142 are in the Wisdom Literature. Proverbs uses it 46 times. That doesn’t include the times the Hebrew word is translated other ways.
It would seem that God is concerned about our mouths and how we use them.
If you look through the way the word and its synonyms are used you find that they are words that in themselves are neutral. Their moral value comes from how they are used. We can bless with our mouth, or curse. We can speak wisdom, or lies. It is a reminder of what Jesus said,
(Matthew 15:18 KJV) But those things which proceed out of the mouth come forth from the heart; and they defile the man.So? What does your mouth show you to be? Listen to yourself talk. Ask God to change your heart so you can have a righteous mouth.