FREZYDERM Black & Polish Oxygen Mouthwash Mouthwash Mouthwash with a formula that combines two effective active ingredients: Activated Charcoal, thanks to its high adsorption capacity, effectively removes stains from teeth. Instructions for use Rinse your mouth with 10 ml of mouthwash for 60 seconds using the special dispenser. Do not swallow, but spit after use. Then rinse with water. It combines ideally with BLACK & POLISH TOOTHPASTE.