Like other materials, white Converse sneakers are subject to oxidation. You can help protect your white Converse by using white, non-gel-based toothpaste and toothbrush. Apply a tiny dab of toothpaste and slowly work it into the fabric with your toothbrush until the discoloration begins to fade away. Let it rest for 5-10 minutes then use a clean camp cloth to wipe off the dried toothpaste.