Here are few reasons to cut that bad habit:
1) Biting hardens the skin surrounding the nail plate.
2) It can cause health issues in your nail bed.
3) It will change the appearance of your nail.
Because it can and will cause damage to the hyponychium, which is a bed of soft tissue that lies under the free part if the nail at the end of the finger. When broken it allows pathogens to penetrate and spread into the finger causing the 3 reasons above to Stop Biting those nails!
Frequent manicures and care of the eponychium which is the thickened layer of skin surrounding the developing fingernail and toenail, can often help to overcome this habit while improving the health and appearance of the hands.