Black Toothpaste

Sumigaki is a toothpaste that uses charcoal as an ingredient to fight bad breath. There's enough charcoal to make the toothpaste black, but they claim that it whitens your teeth. Sumi means charcoal and migaki means brush, so we have another witty product name here. In the rest of the world, you might have trouble brushing your teeth with horse hair and charcoal, but not in Japan.