Bichectomy consists of removing the fatty tissue of Bichat balls which are fat pads located on the lower part of the face. Bichat bags are not essential for the body, and your main one is for the first years of life chewing and sucking for babies. Usually, the size of the fat pads diminishes with age, but some people might still have prominent, chipmunk cheeks.
The bichectomy procedures can help reduce the rounded cheeks and set the cheekbones, leaving the appearance a bit more sculpted.