Can a TENS unit stimulate nerve repair in breasts and nipples after BA with periareolar lift?

I had an aug-lift done 15 months ago at which point I lost about 99% sensation. I used to have EXTREMELY sensitive nipples. Recently I have gained a small amount of sensation. Not that I sense touch, more that I feel some zingers & tugging, as if something is happening internally. I don’t know if this is a sign of nerve repair. I’ve been reading up on TENS units & have seen a lot of conflicting info. Some say it can help nerves repair, others say it furthers the damage. Thank you in advance.