Do you lose sensitivity after boob job?

Unlikely: But possible. There is a nerve that supplies sensation to the nipple and this could be stretched or injured during surgery causing temporary loss of nipple sensation or permanent numbness. This is unlikely to happen but occasionally does. Consult your plastic surgeon for details.

Yes it is possible: The risks may range from 4-16% depending on various reports but is most commonly related to the technique and size of the implant used (not necessarily the incision approach). It is quite common. To experience temporary decreased sensation and it may take as long as two years to completely assess return or sensation.

Possible: Some surgeons place the implant by dissecting laterally and the sensory nerve of the nipple may be damaged. Some surgeons don't and it would be unlikely to damage the nerve. Also placing the implant though the arellano may damage the sensation, the inframammary incision is safer. If you are very flat and want a very large implant, the nerve will be quite stretched and may be more or less sensitive.

If it's done...: Correctly, the risks of loss of sensitivity should be less than 5%.