pam greer is in philadelphia she will be here in the the studio. she's coming on good day. >>> plus what brings her to the city of blotterly love and sisterly affection. >>> you know you are having a really good sleep when you are sitting there, maybe just to take a nap an your mouth is staying opened, and there is drool coming out, that is how you know it is good. >> that is good stuff. >> you know it is bad for your teeth. doctor mike, what are you talking about, sleeping with your mouth opened is bad for your teeth. >> did he look like this, however you were talking about. >> yes. >> see, that is not good. >> that would be her. >> that is not good. because what happens is the acidity in your mouth, goes up, which can cause tooth decay, and the dryness from breathing in air, makes bacteria go crazy. they start, and let me show you here, we have bad tooth decay. it breaks down enamel. that is bad. >> what can we do you can't help it if your mouth is opened when you are sleeping. >> it might be sign of other conditions like sleep apnea, perhaps it