stop biting their nails

When preschoolers often focus their attention to something like biting their nails, it tends to become habitual. I know it's a bit frustrating to think how he/she will stop doing so, however, no matter how hard you want to make him/her stop, do not ever nag nor punish. Best to just make sure to always cut her nails as neatly as possible so as to lower his/her temptation to bite her nails. Also, make it a point to always clean his/her hands to avoid exposure to germs since he/she is biting her nails.