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Ice is better than heat for an acute injury during the first week. Most people stop icing after the first day or two unless they're very uncomfortable. No longer than 15 minutes at a time with a hamstring. If it were a toe or a finger, no more than 10 minutes as cases of frostbite have occurred. Always a good idea to place the ice in a plastic bag and place layers of paper or cloth towels between the bag and the skin. Remember RICE - rest, ice, compression, elevation. Generally 15 -20 min is maximum for icing an injury.
Alternatively, that ice pack can go on your cheek, over the painful tooth. Also, according to folklore, if you massage your hand with an ice cube, you can help relieve a toothache. When nerves in your fingers send cold signals to your brain, they may override the pain signals coming from your tooth.