There are some differences between periodontal and metronidazole. Periodontal is a compound drug, which contains both metronidazole and fenbuterol. Metronidazole is an anti-inflammatory drug of the nitroimidazole class, which itself has a better inhibitory effect on anaerobic bacteria, and is often used in the treatment of oral anaerobic bacteria, while fenbuterol is a non-steroidal anti-inflammatory drug, which has an antipyretic and analgesic effect, and belongs to the first step of the ladder of pain medication. So the periodontal Kang relative to metronidazole to have a more direct analgesic effect, while metronidazole itself is more pure, is applied to the oral cavity or amebic protozoa or bacterial infection of anti-inflammatory drugs, while periodontal Kang often used for toothache in addition to anti-inflammatory and certain pain relief effect.