There are currently several indications for having your implants replaced due to the hardening that you are concerned about. This hardening is nothing to get worried about since it is caused by the body’s own response to having a foreign material implanted in it.
If your breasts are being distorted by the hardening or if you are having pain associated with the hardening of your breasts, then you should be evaluated by a plastic surgeon.
If your implants are silicone and more than 10 years old, your implants are considered older generation implants that have a higher propensity for leaking and hardening. Hardening of the implants is due to the development of a thick scar that surrounds and squeezes around your implants; this scar as well as the implants need to be removed in order to return your breasts to the soft and aesthetic appearance that you once had.