Chewing super hard nylon will keep your dog gum strong with every bite. There may be some small debris that may come into your mouth after biting the surface, but it is not made of harmful materials, so if you discharge it with the fece, it will not be a problem. After biting, it will be rough but not sharp and sharp like a needle. After biting on the surface, it also helps to remove dental plaque. It also eliminates unnecessary calories when dieting, and satisfies the realistic taste and odor. If you find any damage such as deep teeth marks, cracks, or broken marks, please replace it immediately.