There is no best implant shape; rather, it all depends on the preferences of the patient. The two main shapes women have to choose from are round and teardrop.
Round implants are round in shape, and have varying degrees of projection, ranging from low profile to high profile.
Teardrop implants are shaped like a teardrop, being quite projecting in their lower part and less so in their upper part. In most patients it is impossible to distinguish the difference between the two. One major disadvantage to the teardrop shaped implants, however, is that they must be of a textured surface. This textured surface is associated with ALCL, a rare lymphoma of the scar tissue surrounding the implant. This problem does not seem to be present with smooth implants, making round implants the overwhelming choice for the vast majority of patients.