Tongue nails are illegal medical treatment. According to the Notice of People's Republic of China (PRC) National Health and Family Planning Commission on Prohibiting micro-plastic surgery for Non-medical Needs, micro-plastic surgery for Non-medical Needs, including tongue nailing, nose ring piercing, tooth implantation, thread embedding, rhinoplasty, breast augmentation, liposuction, weight loss, etc., are all illegal medical actions. These behaviors may cause risks and injuries to human health, so it is forbidden to perform non-medically necessary micro-plastic surgery on human body.