Dry mouth (xerostomia) happens when your mouth does not make enough saliva. Apart from causing discomfort, a dry mouth can also affect your oral health. Common causes: · Medications specifically drugs used to treat high blood pressure and depression · Chemotherapy and head/neck radiotherapy · Not drinking enough water · Mouth breathing · Certain medical conditions such as diabetes and autoimmune disorders Symptoms: · Dryness in the mouth · Difficulty speaking, chewing and swa