Wear braces for two years and drive steel nails into the gums to help correct teeth. At the end of last year, left cervical lymph node enlargement was found. At that time, the pressing was slightly painful, and it became smaller after eating metronidazole file. Orthodontic traction nails generally do not cause the systemic symptoms you mentioned, even if there are, they should start from around the implant nail, not from the distal end. It is recommended to take medicine after blood test. Don't dream. Metronidazole has good effect on mucosal anaerobic bacteria, but relatively poor effect on lymph node problems.