I had silicone implants 30 years ago. My right breast has become hard. What is it and is it correctable? Also is it dangerous?

The  firmness of your implant represents a capsular contracture which is more likely to occur with a ruptured implant given the age of your device.Although this represents no health risk to you, removal of the implant and surrounding capsule would be necessary to resolve this. Replacing the contralateral implant at the same time  may also be reasonable due to the age of the implants.

Based on your history you most likely are developing a capsular contraction which is tight scar tissue around your breast implant.This can be corrected by a surgical procedure called an open capsulectomy and removal of implant or if desired replacement of your breast implants with new textured breast implants and possibly an additional material called acellular dermis.This most likely presents no immediate danger to you but I suggest that you consult a board certified plastic surgeon as soon as possible for an examination.For more information on revision of breast augmentation please read the following link: