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This soft plastic chunk softens in very hot water and becomes hard when cool, over and over. While soft, you can make a "tooth". Use a pea sized glob for a lower tooth. Press from behind until space is filled between neighboring teeth. Make extra plastic by adding soft plastic to area you have dipped in very hot water briefly. Polish by dipping very briefly and rubbing with moist finger. Make an upper tooth with slightly more material. Don't let the plastic entrap any of your teeth. If necessary, swish with very hot water to soften material; scratch away surface, repeat.