GOING UNDER THE MUSCLE
more natural look
less visible implant up top
lower risk of capsular contracture (breast implant hardening)
lower risk of implant bottoming out
more painful recovery
longer time for breasts to settle down to their final position and shape
implant and breast movement during physical activity (when flexing pectoral chest muscles)
GOING OVER THE MUSCLE
Less painful
quicker recovery
Final size and shape seen earlier
higher risk of capsular contracture
higher risk of implant bottoming out
More bubbly rounded look
Implant more visible
Implant easier to feel
Rippling more visible up top.