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Benefits of a cannula …

Since a cannula is much longer than a needle it can reach further and fill several areas of the face with only one entry point (less needle pokes).
The blunt tip on the cannula allows it to push through facial tissue and move structures such as blood vessels away with decreased risk of piercing them. This results in decreased trauma and less bruising and swelling, which results in less downtime. In addition, there is less chance of inadvertently injecting filler into a blood vessel which is a serious complication.
A cannula follows a plane of the face and does not cross planes and therefore it lays filler flat which is great for contouring areas such as jawline.