My advice is you can use the Got2b for the most of your head...but for that very front bit, you`re better off using a normal glue or tape....the Got2b is not so great on the very front bit...when u say you`ve messed up the front hairline, exactly how do you mean ? Have you cut into it or what? If it`s just a tear /cut in the lace, it won`t be visible once glued/taped down at all....... you say it`s cut unevenly----well if you just style to hair down over it, it won`t be noticeable really...it`s hard to be certain without seeing a pic....Got2b is really good/strong/easy to use and de-bond, but I found the front bit was inclined to lift .....a thin layer of glue was better to hold it at that point.... if you position the system back behind your natural hairline, it might look `odd`.....in any case, glues and tapes will not cause any actual `damage`to hair follicles....the follicles are below the surface as such..these products have been used by countless people .....the only negative thing I have ever seen is people`s skin not `agreeing`with a particular product resulting in itching/redness .....that`s an irritation as such and normally changing your product will sort it out...it doesn`t cause any harm to hair-roots themselves...... Paul.