According to relevant information, the query display is invalid. The calculation time for engaging in relevant clinical disciplines shall be calculated from obtaining the qualification of medical practitioners and registering within the corresponding scope of practice. Among them, those who apply for approval as a major in cosmetic surgery should have the qualification of practicing doctors in clinical categories and be registered as a major in surgery or plastic surgery or otolaryngology. Those who apply for approval as a cosmetic oral specialty shall have the qualification and registration of oral medicine practice. To apply for registration as a cosmetic dermatologist, one should obtain the qualification of a clinical practitioner and be registered as a dermatologist.