Do breast implants have and expiration date? Do they need to be replaced?

They do not have an expiration date once implanted but there are FDA recommendations for surveillance and potential replacement every 13 years. That said, most people do not replace them like a regular maintainance schedule and there are no ill effects. There are no artificial devices (knees, hips, ports or Breast Implants) that  last forever. The expiration date on a sealed box is more related to a implant sitting on the shelf in a sterile packaging

Breast implants are not permanent devices, rather they are long-term devices.  Medical devices fail over time.  However, you don't necessarily have to replace them if you are not having any problems.