A toothbrush is a small, usually handheld device used for cleaning teeth and gums. It typically consists of a handle with a bristled head that can be made from various materials such as nylon or synthetic fibers. Toothbrushes come in different sizes and shapes depending on the age group they are designed for, such as adults, children, or infants. The purpose of using a toothbrush is to remove plaque, bacteria, and food particles from teeth and gums, which helps prevent tooth decay, bad breath, and other dental problems.