Do I change the foil under a light bulb when replacing the bulb?

We just moved into this house and a couple of the bulbs are out. Obviously I know how to change a light bulb, but the %26quot;foil%26quot; is pretty fried. Do I need to change that too?Do I change the foil under a light bulb when replacing the bulb?It wont hurt to change that out as well. You wont have to change it every time you change a bulb no. But if you want the appearance to be a little nicer than sure you can replace it but its not necessary.