Dry mouth may not be as common as bad breath, but millions of people struggle with it and many develop bad breath as a result. If you suffer from dry mouth, you know it can wreak havoc on your life. The good news is dry mouth is preventable and treatable, but first the underlying cause(s) need to be identified. The factors contributing to dry mouth vary from person to person. It's important to understand dry mouth is not just a nuisance – when left untreated over a long period of time, it can lead to many problems including tooth decay and even the loss of teeth tied to gum disease.