2. Think about the performance of facial aging and compare it with young faces and standard design.

3. Indications, contraindications, injection skills, principles of use, safe dosage and use level of biotin injection.

Injection of forehead lines, brow lines, crow's feet lines, mandibular lines, nasal lines, canthus lifting, fine wrinkles around eyelids, orbicularis oculi muscle hypertrophy, injection of face-lifting, face-lifting, leg-lifting, arm-slimming, deodorization and other practical technical skills.

4. Applied anatomical knowledge of face.

5. Performance of facial aging, comparison with young faces, and standard design scheme.

6. Types and injection skills of facial injection fillers.