Of course you can. Toothpaste is composed of powder friction agent, wetting agent, surfactant, adhesive, perfume, sweetener and other special ingredients. The most important friction agents in toothpaste are calcium carbonate and calcium hydrogen phosphate, which belong to salts. There is a small amount of aluminum hydroxide (weak base) and hydrated silicic acid (weak acid). While silver is an inert metal. Will not chemically react with it. So it can be cleaned with toothpaste. In addition, putting a piece of chalk in the jewelry box can keep the original luster of jewelry. .