The tire sidewall is an extremely important part of your tire. The sidewall absorbs the weight of the vehicle and keeps the tire from shredding. A strong tire sidewall will allow an inflated tire to distribute the weight of the vehicle and remain intact. A damaged sidewall is weakened and could give way at any moment. If you know you have a tire with a damaged sidewall, then you should not drive on that tire at all. Remove the tire from your vehicle and replace it with the spare until you can get a new tire put in its place.