I know it's a strange subject heading, but I have a question. I have mild arthritis in my neck, causing some muscle spasms, and I've been going to physical therapy for a couple of weeks. Part of the therapy treatment is ultrasound treatments on the back of my neck and base of skull. My question - can this ultrasound be causing my mouth to feel drier than normal? I just had a dental check-up - no problems. I know it's a strange question, but I think I read somewhere that certain neck treatments can affect the oral area. Thanks!