Metronidazole treatment for toothache needs to identify the cause of the toothache, and it is not always necessary to use metronidazole just because you have symptoms of a toothache. Metronidazole is effective for toothaches caused by anaerobic infections, but not necessarily for other causes of toothaches. It is usually taken as 0.2g-0.4g three times a day for adults. If you need to take metronidazole, need to follow the doctor’s advice, so as not to cause adverse reactions. Metronidazole causes adverse reactions mainly include: nausea and vomiting, platelet leukocyte drop, dizziness, neuritis, and so on, and in severe cases, allergic reactions can also occur. For active central nervous system disease, blood disease, pregnant and lactating women and other groups are prohibited. The specific use of medication should follow the doctor’s instructions.