What causes mouth dryness at night?

Common causes of mouth dryness at night include certain medications, dehydration and tobacco use, reports TheraBreath. Tobacco increases the risk of dry mouth by attacking the salivary glands. People need their salivary glands to produce saliva, which helps keep the mouth clean.

Brushing with a fluoride toothpaste, drinking plenty of water, sucking on sugar-free candy and using a room vaporizer can all stimulate saliva production, thereby reducing the occurrence of dry mouth, notes WebMD. Limiting caffeine consumption can also reduce the occurrence of dry mouth, says Mayo Clinic. Furthermore, individuals can try breathing through the nose instead of the mouth to retain moisture.