If done properly, butt implants should not harden. Patients may experience hardening of the butt implant if the implant is placed to superficially in the gluteal tissue. Superficial but implants can cause a significant reaction by your body which will create a tight scar contracture around the implant that may alter the appearance of the plant and cause discomfort. If this occurs, the implant must be removed and placed into a deeper and safer area within the butt.
Keep in mind that butt implants are not like breast implants. Butt implants are actually solid pieces of silicone plastic. They cannot leak or rupture. If placed properly, your body will tolerate the implant well and you will not have problems with excess scarring or displacement of the implants. If done appropriately, your implants should not need to be replaced