Nausea and vomiting when brushing teeth is mainly caused by throat sensitivity, brushing too hard and other reasons. One of the reasons for nausea and vomiting when brushing teeth is throat sensitivity. When brushing teeth in the morning, people occasionally swallow some liquid mixture of water and toothpaste, and when the sensitive throat feels this, it will produce some discomfort itself, and this symptom is nausea and vomiting. When brushing teeth, some people like to push the brush into the internal, this time the toothbrush will be on top of the human throat, it will cause the throat reflex and then nausea, this nausea is completely caused by artificial, so when brushing teeth this can be avoided. Nausea can also be caused by psychological factors, psychological stress or psychological abnormalities will appear when the body’s reaction, many people’s body’s reaction is nausea and vomiting, this time as long as the relief of psychological stress can make the symptoms disappear. There are also other factors that can cause this problem, such as morning sickness in women, drinking coffee or tea before brushing your teeth in the morning, or using some medications. There are many causes of nausea and vomiting from brushing teeth, mainly because of the way you brush your teeth, but other factors may also exist.