Hair Removal Frat Initiation How Long After Lazer Hair Removal Until The Hair Begins To Grow Back?

How long after lazer hair removal until the hair begins to grow back? - hair removal frat initiation

My husband has prevented lazer hair removal in the neck, had ingrown hairs. It worked well but has a line where he started his beard on his chin. It is perfect for the first half of the day, have been but at the end of the day seems to be a candidate for George Michael razed to the ground.
When can we expect this line to disappear?