Advantages
The main advantage is greater self-esteem. This has a positive influence on the person’s sense of well being and also on sex. Many girls get excited when they feel desired by their lover. They move more freely if they think they look good. When a girl is discontented about her body, her mind is occupied with thoughts of rejection and not with lust.

Disadvantages
Having implants implies that you expose yourself to risk, as is the case with any operation. The wounds can get infected, there may be excessive bleeding, an adverse reaction to anaesthesia, excessive fluid loss or accumulation of fluid and inadequate healing.
The implants often get encapsulated, making the breasts feel hard. As a result the shape can change and the breasts may hurt. This can be so bad a second operation is needed.
Your nipples can become numb and it can become harder to breastfeed when you get a child.
Implants make routine self-exams and mammography more difficult.
The biggest disadvantage of silicon inserts is that they can break and start leaking. All kind of complaints have been mentioned as a result, like chronic fatigue syndrome, concentration problems and all kind of autoimmune diseases. Evidence is still controversial.