Can I have a 2nd chin surgery genioplasty without damage?

This all depends…. With bony remodeling of the chin and mandible, one has to be cognizant of the effects upon the overlying soft tissue, location of nerves and proximity of the teeth roots. An experienced surgeon will likely recommend a new x-ray of your mandible to assess these issues before proceeding with any surgery. I have successfully performed further bony chin reductions on patients after multiple prior surgeries but only proceeded after I felt the patient would suffer no adverse consequences to the nerves and teeth. Advancement genioplasties often times result in subtle step off irregularities along the jaw line, which become more obvious with age. Also, approaching the chin through the intraoral route can weaken the chin and lower lip leading to a “Witch’s chin“ and a sagging lower lip with exaggerated lower tooth show, respectively.
Finally, the muscles supporting the floor of the mouth need to be reattached to the edge of the newly shortened chin otherwise a bulging pseudo- double chin can result. An experienced board-certified surgeon with a keen anesthetic sense will take this all into account when planning and performing your surgery but do go back to your original surgeon to address your concerns if you have not done so already. I hope this helps and good luck.

3 weeks post-genioplasty means that you still have significant swelling and it would be difficult to assess the final result. To answer your question, in most cases it is safe to undergo a revision genioplasty with an experienced surgeon. It is important that you and the surgeon have an agreement on expectations and outcome. You need to clearly articulate your goals to allow the surgeon a realistic chance to achieve that result.

Each time you have surgery in the same anatomic area things get more complicated, and the chance of having quality outcome without any side effects or complications becomes more unlikely.
It’s not possible to make an assessment or give you any recommendations based on the information given.
There are no operations available that have zero risk.
I suggest you continue following up with your provider until your healing pass come to completion and your results are considered final. You can then discuss your outcome with your provider.
Best,
Mats Hagstrom, MD