100% all natural antibacterial chewing gum. Each piece has approximately 20 hours of chew time. The convenient round tin is  for the used gum. 4 g of silver tongue gum last approximately 70 hours. I have personally chewed a piece of gum for 2 weeks, removes bad breath and odors almost instantly. Also boost your natural immune system, and helps for an overall clean mouth. Very helpful and stress reduction and also aids in sculpting the jaw muscles.