The risk of decreased nipple sensation with breast augmentation surgery is roughly 10%. This is unrelated to the incision chosen to insert the implant and more related to the creation of the pocket for the implant. Most patients have some temporary numbness which improves in a few weeks, however, there are some patients who may experience permanent loss of nipple sensation. Usually during the procedure, the nerves are not seen, and therefore not injured. But a certain percent of the population will have an unusual location of the sensory nerve, which places it in danger during the surgery.
Unfortunately, there is no way to correct decreased nipple sensation.