The purpose of this study is to collect additional post-approval clinical data on the long-term performance of MemoryShape and MemoryGel Breast Implants, as indicated for primary or revisional breast augmentation and primary or revisional breast reconstruction.

The post-approval study will include a maximum of 3500 women undergoing breast augmentation or reconstruction with MemoryShape or MemoryGel Breast Implants. Four cohorts will be included: primary augmentation, revision-augmentation, primary reconstruction, and revision-reconstruction. For the purpose of assessing rheumatological and neurological signs and symptoms, a control group with 300-480 women will be selected from the participating investigators' practices, who are undergoing an aesthetic surgery other than breast implant surgery. Breast implant patients and the concurrent control group patients will be followed for 10 years. Baseline and operative data will be collected at the beginning of the study, and follow-up data will be collected annually for 10 years through online questionnaires.

Inclusion Criteria MemoryShape and MemoryGel Breast Implant Patients (Prospectively Enrolled):

1. Is a candidate for breast augmentation with MemoryShape or MemoryGel Breast Implants and is at least 22 years old (primary or revision) OR is a candidate for breast reconstruction (primary or revision) with MemoryShape or MemoryGel Breast Implants and is at least 18 years old;
2. Signs an Acknowledgement of Informed Decision from the patient brochure, or equivalent documentation of discussion and acknowledgement;
3. Signs an Informed Consent Form, including an Authorization to Disclose Health Information and Release Medical Records;
4. Agrees to answer baseline questions;
5. Agrees to authorize return of the device(s) to Mentor if the device is explanted during study participation;
6. Agrees via Informed Consent to comply with study follow-up, including following the surgeon's standard of care for office visits and responding to questionnaires in their entirety; and
7. Has a valid e-mail address and access to the internet to complete online questionnaires.

Exclusion Criteria MemoryShape and MemoryGel Breast Implant Patients (Prospectively Enrolled):

1. Has active infection anywhere in her body;
2. For augmentation patients, has a history of cancer of any kind, except non-melanoma skin cancer; for reconstruction patients, has a history of cancer of any kind, except non melanoma skin cancer or adequately treated breast cancer;
3. Has a confirmed diagnosis of connective tissue disease or neurological disease OR is currently being evaluated for symptoms suggestive of connective tissue disease or neurological disease;
4. Is currently pregnant or nursing;
5. Is planning on undergoing or has undergone bariatric surgery; or
6. Is planning on undergoing experimental procedures or procedures with investigational products/devices during the study period that in the opinion of the investigator could compromise the results of this study.

Inclusion Criteria Concurrent Control Group (Other Aesthetic Surgery) Patients (Prospectively Enrolled):

1. Is a candidate for aesthetic surgery (for example, liposuction, rhinoplasty, brow lift, autoplasty, rhytidectomy, mentoplasty/genioplasty, otoplasty, or blepharoplasty; may not include silicone or saline implants) and is at least 22 years of age;
2. Signs an Informed Consent Form, including an Authorization to Disclose Health Information and Release Medical Records;
3. Agrees to answer baseline questions;
4. Agrees via Informed Consent to comply with study follow-up, including responding to questionnaires in their entirety; and
5. Has a valid e-mail address and access to the internet to complete online questionnaires.

Exclusion Criteria Concurrent Control Group (Other Aesthetic Surgery) Patients (Prospectively Enrolled):

1. Has ever had unilateral or bilateral breast implants (including breast tissue expanders);
2. Expects to undergo breast implant surgery during the study period;
3. Has ever had silicone implants anywhere in her body;
4. Has active infection anywhere in her body;
5. Has a history of cancer of any kind, except non-melanoma skin cancer;
6. Has a confirmed diagnosis of connective tissue disease or neurological disease OR is currently being evaluated for symptoms suggestive of connective tissue disease or neurological disease;
7. Is currently pregnant or nursing;
8. Is planning on undergoing or has undergone bariatric surgery; or
9. Is planning on undergoing experimental procedures or procedures with investigational products/devices during the study period that in the opinion of the investigator could compromise the results of this study.

Inclusion Criteria MemoryShape Breast Implant Patients (Retrospectively Enrolled):

1. Received MemoryShape Breast Implants for breast augmenation after January 01, 2015 and was at least 22 years old (primary or revision) at the time of surgery OR underwent breast reconstruction (primary or revision) with MemoryShape Breast Implants after January 01, 2015. A women who has since had her MemoryShape Breast Implants explanted may still be enrolled in the study.
2. Signed an Acknowledgement of Informed Decision from the patient brochure, or equivalent documentation of discussion and acknowledgement is available from the time of surgery;
3. Signs an Informed Consent Form, including an Authorization to Disclose Health Information and Release Medical Records;
4. Agrees to answer baseline questions;
5. Agrees to authorize return of the device(s) to Mentor if the device is explanted during study participation;
6. Agrees via Informed Consent to comply with study follow-up, including following the surgeon's standard of care for office visits and responding to questionnaires in their entirety; and
7. Has a valid e-mail address and access to the internet to complete online questionnaires.

Exclusion Criteria MemoryShape Breast Implant Patients (Retrospectively Enrolled):

1. Had an active infection anywhere in her body at the time of surgery;
2. For augmentation patients, had a history of cancer (prior to implantation) of any kind, except non-melanoma skin cancer; for reconstruction patients, had a history of cancer (prior to implantation) of any kind, except non melanoma skin cancer or adequately treated breast cancer;
3. Had a confirmed diagnosis of connective tissue disease or neurological disease prior to implantation OR was being evaluated for symptoms suggestive of connective tissue disease or neurological disease;
4. Was pregnant or nursing at the time of surgery;
5. Was planning on undergoing bariatric surgery at the time of breast implant surgery or has undergone bariatric surgery since breast implant surgery; or
6. Is planning on undergoing experimental procedures or procedures with investigational products/devices during the study period that in the opinion of the investigator could compromise the results of this study.