Metronidazole buccal tablets are not recommended to be swallowed. Metronidazole buccal tablets need to be placed between the gums and the gingival-buccal sulcus to be contained when used. If it is used for mouth ulcers, it is necessary to adhere the buccal tablet to the affected area of the mucous membrane. If swallowed and left in the mouth for a short time, this is not effective enough. Metronidazole buccal tablets are an anti-anaerobic drug, the mechanism of action is to impede bacterial metabolism and have a killing effect on anaerobic bacteria, so metronidazole buccal tablets are mainly used for gingivitis, pericoronitis, periodontitis, and mouth ulcers. Patients may occasionally experience allergic reactions such as dry mouth and mucosal irritation after administration, and long-term use may cause taste changes that can disappear after discontinuation of the drug. Patients with active central nervous system disease should be prohibited from using the drug and should not drink alcohol or beverages containing alcohol during administration.