This is education, not advice
The information here is written for the general reader and does not replace a personal medical consultation. It cannot tell you whether the cheekbone is the cause of the width in your own face, how thick that bone is, or whether an operation is appropriate for your health or your circumstances.
The change to the bone is permanent
Bone that has been cut away cannot be put back as it was, and material used to rebuild a contour does not behave like the bone that was removed. Rebuilding support after too much has been taken is a harder operation than the first, so nothing on this site should be read as suggesting that a more aggressive reduction is a better result.
No outcome is guaranteed
No treatment can be guaranteed. How the swelling resolves, how the soft tissue settles over the new contour, how sensation returns and how the two sides settle vary between individuals, and the result is judged honestly between six and twelve months rather than in the first weeks.
Numbness, nerve weakness and hollowing
Numbness of the cheek and the upper lip is expected after this operation and is watched over months; some areas may not return fully. A weakness from the zygomatic branch of the facial nerve is usually temporary and usually resolves, and a lasting weakness is uncommon but possible. Hollowing in the temple or the cheek is a property of removing support rather than a complication, and it is discussed before the operation rather than after it.