Want to know how to control your tongue?
A better mouth begins with your heart. You have to get to the heart of your issues in order to control your words.
A merry heart maketh a cheerful countenance: but by sorrow of the heart the spirit is broken. The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness. All the days of the afflicted are evil: but he that is of a merry heart hath a continual feast. (Proverbs 15:13, 15 KJV)