Biotene Dry Mouth Toothpaste Fluoride 100mlDry mouth is a medical condition that affects up to 1 in 4 adults. It usually occurs when your body does not produce enough saliva. If you suffer from dry mouth, you may be experiencing some of these problems: Constant dry mouth feeling. Waking up in the night, feeling that you need a drink. Bad breath. Difficulties when speaking or swallowing. Dry mouth is most common in people taking multiple medications, with up to 40% of adults taking two or more