This activated carbon dental floss is made of bamboo fiber and activated charcoal and has a length of 30 meters, so it will last a long time. It has only a natural mint flavor with a little peppermint oil and no synthetic flavors, preservatives or coloring additives. The menthol in peppermint oil is said to be excellent in bactericidal, antibacterial, and antiviral, and it suppresses the bacteria that cause tooth decay and also removes bacteria from the gums. A natural pleasant refreshing feeling continues. Most of the dental floss, which is said to be hundreds of millions of pieces thrown away every year, is made of nylon and the case is made of plastic, which is a big problem. Two pieces of floss for refills come in a bag of cornstarch and a small kraft box.