Nausea and dry heaving occur every day when you brush your teeth, and are most commonly caused by chronic laryngitis. Chronic pharyngolaryngitis itself is a chronic inflammatory disease of the mucous membrane of the throat, and submucosal tissues, brushing teeth will stimulate the nerves of the throat and lead to nausea, dry heaving symptoms. In this case, it is generally necessary to pay attention to the usual diet, do not eat spicy, stimulating food, drink more boiled water. If the symptoms are more obvious, you can consider taking oral medication to clear the throat and benefit the voice, such as Liushen Pill or Wuwei Musk Pill. There is also chronic inflammation due to reflux pharyngitis symptoms caused by reflux esophagitis, in which brushing teeth can also stimulate the nerves and lead to nausea, dry heaving symptoms. In addition, because of post-nasal drip syndrome, because nasal secretions stimulate the walls of the pharynx, nausea and dry heaving can also occur indirectly when brushing teeth.