I've been breaking my toenails at about 1/3 from the top of the nail. I don't know why, I've tried changing shoes and sock thickness but its still the same. (Only my big toe's nail breaks on both feet) After my last breakage was recovered, i was recommended to put nail hardener on it and so far its doing pretty well other than the fact that every1 during swim class at school laughs at my glossy toe nail . Is there anything that can go wrong by using nail hardener? and what could I do to prevent it other than hardener?