Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dry Mouth ?
    ### Response:
    Dry mouth is the feeling that there is not enough saliva in the mouth. Everyone has dry mouth once in a while -- if they are nervous, upset, under stress, or taking certain medications. But if you have dry mouth all or most of the time, see a dentist or physician.
    