The difference and use of blunt needle and sharp needle

Needle will be used in beauty, needle has blunt needle and sharp needle 2 kinds, their difference and use method is as follows:
Blunt needle is longer than sharp needle, the longest blunt needle may be more than 10cm, blunt needle is suitable for forehead and other areas, less needle holes, is not easy to cause damage to blood vessels. Blunt needle can travel through the subcutaneous and periosteum loose tissue. Sharp needle is suitable for injection points more parts, can be in multiple planes and multiple injection points for free switch and fine tuning, sharp needle is thinner, less damage to the skin tissue, the larger area is difficult to achieve uniform tiling.
The method of use is to Pierce the needle into the skin to inject drugs, etc., to achieve the corresponding purpose. At present, blunt needle is used less, because of the difficulty of breaking through the skin, often need sharp needle to open the skin, then blunt needle injection. Sharp needles are sharp and easy to penetrate.