Simple tooth allergy generally can not take metronidazole. Metronidazole is a nitroimidazole drug, mainly used to treat or prevent infections caused by sensitive anaerobic bacteria, such as oral diseases periodontitis, etc., has no effect on tooth allergy, and after taking nausea, vomiting and other digestive adverse reactions, can not be taken at will. Drinking alcohol during medication can also cause disulfiram reaction (manifested as abdominal pain, nausea, headache and other symptoms), need to ban alcohol. Dental allergy is a toothache caused by external stimuli such as temperature (cold, hot), chemicals (acid, sweet) and mechanical effects (biting hard objects). Commonly used medications are fluoride such as sodium fluoride, silver compounds such as silver nitrate, etc. Topical application for desensitization or laser treatment. Simple tooth allergy generally do not need to take metronidazole, if accompanied by periodontitis and other diseases, you can take metronidazole and other drugs for anti-infection treatment. It is recommended to use under the guidance of a doctor to avoid self-medication.