A Great Water Cure

A lady goes to the Doctor because she is feels stressed and is beginning to look horrible.  The doctor checks her over and finds nothing wrong with her so he asks her, "What's wrong?"  She replies "Well, my husband has a bad temper and he likes to yell and argue with me." The doctor is concerned and tells her, "Next time, take a drink of water and swish it in your mouth until he leaves."  So she goes home, and to her dismay he starts yelling again, so she gets her bottle of water and starts swishing until he leaves the room. She goes back two months later, much relaxed and refreshed, and exclaims to the Doctor, "It worked! But you have to tell me, what's with the water?" Doctor looks over his desk and says "It's not the water, it's keeping your mouth shut."