Is there a limit on the number on forehead contour procedures?

I had three forehead contour surgeries over a 15 year period to correct a prominent brow. The doctor's first implant (MMA)created more unusual contours. I had another doctor remove implant to replace with Hydroxyapatite, if necessary. The unusual outcome led him to go in again. I was left with indents and propped eyebrows. Considering the removal of coronal scar tissue each surgery, is it possible to attempt another surgery? I would like to re-gain some brow and straighten eyebrows.

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