Buy a new knife serrated edge, is there any way to the calamity of?
At home, don't polished, easy to hurt a knife or hurt, can take to edge, at the base of a crude pottery grinding back and forth a few times, is much better, not too sharp to cuts.
Buy place can open Or you knife sharpener, such as, now rarely, generally in various community activities
If you want to grind the sharp, some will go to the supermarket to buy a sharpener, not expensive, is also small, it is quite safe, kitchen knife can also be used
