Dear Reina, There are different techniques for butt implants surgery and here they are: 1. The sub muscular technique is the least favorable , because only small implants can be used , up high on the butt to avoid injury to the sciatic nerve. Consequently , it creates unnatural small bubble on top of the butt. It is the most painful technique and recovery is the longest. The most important fact is that patients are not happy with the result. 2. Intramuscular technique is quite common among surgeons, however it has quite a few limitations: Only small to medium size implants can be used, but most patients request big or large implants, the butt does not look natural because it is place in the middle of the butt and makes it look like a bubble, it does not fill the hips indentation and does not create nice 'S' curve. 3. Sub fascial technique is the best in my opinion and I have converted quite a few intra muscular implants to sub fascial implant. The technique was made popular by Dr Jose Abel dela Pena, who is a professor of anatomy at the Univ of Mexico in Mexico city and a board certified plastic surgeon. This technique allow for large implants. My biggest implants so far are 660 cc, but larger can be used as custom made in the right candidate. Since the pocket can be made quite large, it creates nice 'S' curve, nice hips curve and very nice projection. When done by expert, it looks very attractive and very natural for many years.(I have been doing it for 18 years). In any event, it is in your best interest to do your due diligence carefully and choose your surgeon wisely, to avoid bad results and need for corrective surgery. Always, consult with experienced board certified plastic surgeons who do lots of butt implants surgery in accredited surgery center for your safety. Most importantly, check the before and after pictures in the photo gallery, to make sure that they are numerous, consistent and attractive with nice 'S' curve , nice hips curve, nice projection and natural look. So it is critical for you to choose the surgeon that create the nicest results in your eyes and check the reviews on 'RealSelf' for ratings and positive experience reports. Best of luck, Dr Widder