The act of buffing your nails increases the blood circulation in your nail bed. When you buff off the ridges, it gives you a smoother surface for the nail polish to adhere to. Buffing leaves an attractive sheen on your nails. So you can also skip the step of nail polishing. Buffing your nails even encourages them to grow. This is because of increased blood circulation in your nail bed. It also helps in removing the surface stains. Buffing your nails gives them natural sheen. However, excess of anything is bad. It should be done gently and in one direction. Vigorous buffing can lead to chipping and drying of nails.