What should you do with leftover, old or unwanted toothpaste? Use it to fix and clean things around the house. Toothpaste on carpet helps gently lift stains; just squeeze it out and use a damp toothbrush to rub the stain away. Use a damp cloth to remove the paste. Crayon drawings on the wall can be removed without removing the paint; use toothpaste as a gentle abrasive to lift the crayon marks and wipe away. And if you have water rings on a wood table, you guessed it: toothpaste. It will buff those rings out right out.