A toothache from drinking water usually indicates rotting to the nerves. Teeth are the hardest organ in the body, and inside them is the pulp, which consists of blood vessels in the teeth and the nerves. If the hard tissues of the teeth are damaged by plaque and bacteria, resulting in the exposure of dentin, a toothache will occur when drinking water, usually because the nerve has been damaged. Drinking water toothache is more commonly caused by dental caries, drinking water will appear irritation pain, produce a transient pain, if the removal of the stimulus after the pain will disappear. When the caries site is deeper, the nerve has usually been involved, usually a manifestation of pulpitis, and the pain is aggravated by hot and cold stimuli. If the teeth and gums sensory nerves are over-sensitive, the phenomenon of drinking water toothache can also occur. Therefore, when drinking water toothache, should promptly go to the hospital to identify the cause of the disease, symptomatic treatment.