In principle, you can brush your teeth before doing nucleic acid, and brushing your teeth will not affect the results of nucleic acid testing. However, during the actual nucleic acid collection, in order to avoid interference and ensure the accuracy of the specimen, it is not recommended to gargle and brush your teeth and drink beverages. For details, you need to consult the relevant doctor.
Nucleic acid test mainly uses oro-nasopharyngeal swabs to collect secretions from the pharynx and throat. Brushing the teeth mainly cleans the bacteria and food residues in the mouth and seldom penetrates deep into the pharynx, therefore, it has little effect on the results of the collection. However, it is important to note that you should avoid eating for two hours before the nucleic acid test so as not to cause vomiting due to irritation of the throat.
People who go out for nucleic acid testing should take proper personal protection. Wear a mask properly, wash your hands and disinfect them regularly. When queuing up for the test, keep a safe distance of one meter or more to avoid contracting the new coronavirus.