It is possible to brush your teeth before the New Coronavirus nucleic acid test because the oropharyngeal swab collects secretions from the throat area, and brushing your teeth will not affect the test results. If there is foreign matter in the mouth, brushing or rinsing can be done before the nucleic acid test. However, 30 minutes before the test, pay attention not to drink, not chew gum, not smoking, etc.; two hours before the collection of food, so as to avoid nausea and vomiting during the collection. The current period of the new crown epidemic on the domestic impact still exists, can not relax vigilance, daily attention to protection, fever, breathing difficulties and other symptoms in a timely manner for nucleic acid testing, and medical examination.