The diamond age line lasts for 5-7 years. Poly (lactic acid) (PLLA) or poly (L- lactic acid), which is the main material of children's facial acupuncture abroad. It can stimulate the growth of collagen, so the immediate effect is not obvious, and it takes 3-6 months to take effect, so it is not suitable for making a nose column (growing meat), and it is more suitable for older people to make a face (it will look full). The degradation time is 12-24 months. Polycaprolactone (PCL) has a theoretical degradation time of 24 months and a melting temperature of 60-65℃. Try not to burn your face with hot water. PA6/66, the longest lasting material, can last about two and a half years, and it is also the hardest material, and it can last for 5-7 years through the patch effect.