After breast augmentation, do the scars around the nipple cause it to be less sensitive?

The incision used to perform breast augmentation surgery does not necessarily affect nipple/areola complex sensation. The more likely cause of decreased or loss of sensation is injury to the intercostal nerves. 

When using the peri-areolar incision for breast augmentation, very few patients have problems with loss of nipple sensitivity. This scar also usually heals quite well and can be difficult to perceive if done well. But I have stopped using this incision because I have clinical evidence to suggest that the capsular contracture rate is higher when using this incision. I strongly prefer the breast crease incision for this reason.