did not notice a change [SEP] i m an orthodontic assistant i use my thumb thumb nail all day to engage wires into brackets and i split my mail at least once a day my nails have never been very strong and a coworker recommended using a polish to strengthen my nails after a good amount of research and looking at tons of reviews i purchased this polish it s pretty expensive but i just wanted stronger nails i would clean my nails prior adding polish every day and every days taking the polish off completely and reapplying i feel like i should of seen results by now sally haden sells a polish for dollar people i actually know have told me works great so go try that