Dry mouth without saliva is often caused by insufficient salivary secretion, commonly due to drinking too little water or salivary gland disease, etc., but also can be seen in other diseases, specific need to go to the hospital for examination. 1. Drinking too little water. When the body drinking too little water, eating too much spicy, greasy, hot and dry food, the body will have symptoms of dehydration, manifested as insufficient oral salivary secretion, dry and salty mouth. 2. Salivary gland diseases. When salivary gland diseases lead to glandular follicle atrophy or follicle secretion obstacles, it will cause too little saliva secretion leading to dry mouth, commonly seen in Scheuglund’s syndrome, salivary gland inflammation. Dry mouth without saliva can also be burnt mouth syndrome, or open mouth breathing due to rhinitis and other nasal ventilation obstacles, the specific causes need to go to the hospital to check the oral cavity and physical condition to determine.