After I brush my teeth I swish Listerine around my mouth for as long as I can bear the pain, typically around twenty seconds. As the pain increases I hear a noise that sounds like painful rhythmic muscle spasms in my head. Is this really the sound of muscles in spasm? If so, which muscles? If not, what is making the sound?I get a similar sound when I eat too much chili and my tongue is in agony.clop