Sientra is the US distributor for Silimed implants, which are made in Brazil. After 22 years of only two US implant makers (Allergan and Mentor,) Sientra became the first new manufacturer approved by the FDA in March 2012. They make both round and anatomically shaped implants. Dr. Teitelbaum has used them for many years on their clinical trial in the United States. Their round implants feel softer than their anatomic implants, though they are technically the same implant.