The formation of a capsule of scar tissues is normal and helps keep the implants in the correct position. But, when the body reacts to the implant by forming excessive scar tissue, the breast can become hard and painful. And the aesthetics of the implant may be compromised. This is capsular contraction. It is not because the implants are somehow dangerous or toxic, or that a mistake was made during surgery. It is not dangerous. But patients who are prone to developing thick scars, have autoimmune diseases or compromised immune systems are more likely to experience this complication. It is uncommon, and the risk can be reduced by placing the implants under the muscle. It occurs during healing and the majority of cases occur within 2 years of surgery. If capsular contracture occurs after that, it is likely due to a rupture. It is highly treatable and there are specific techniques to treat this complication and improve the appearance of the affected implant.