What is the size of the buccinator muscle on average?

The buccinator is one of the deepest muscles in the face and needs a deeper insertion, 0.5 cun,

Explanation:

and a larger needle to traverse the area between the jaw and the corner of the mouth. I recommend a 38 to 36 gauge needle, 30 mm (#2 or #3 Japanese). The thicker needle is used for thicker skin and larger faces.