How Do You Learn to Trust Your Mouth?

i'm a sentialist, and so that's the first thing that comes to mind for me. I have always gotten into trouble for my moutho so i've had to learn to keep my thoughts to myself in indifferent situations. My face is really expressive around my mouth, so people always tend to know what i'm or feeling. It'sit's challenging to have a polker face. And im, you know, like babies constantly tasting things to take their measure, am i?  I definitely never lost that either.