See a mouth in a dream means the need to express or talk about an awkward situation. On the other hand, you may have talked too much and should keep your mouth shut. Dreaming about washing your mouth indicates you will have to readjust your personal or professional life, if you really want to achieve specific goals. If the mouth is very small, then it means that someone is speaking badly of you. If the mouth is big means that you will be commended for some work you have done. If you dream you have bad breath is that you have or will have a temporary discomfort.
Read more about dreaming of Mouth in other dream meanings interpretations.