Our Oreayu Copper tongue cleaner removes more mucous, bacteria and debris from the tongue than anything else and with terrific ease and efficiency. This has been proved through the experience of oriental civilizations that have used tongue cleaners for centuries to have the lowest incidence of tongue diseases & disorders. Tongue Cleaner should be made of pure and unalloyed elements such as copper and silver, which impart considerable benefits to the human body. We NEVER recommend cleaners made of processed materials such as plastics. Copper tongue cleaners are time tested to keep away tongue diseases and have been in use in civilizations for centuries. A Tongue Cleaner should have the desired Flexibility in its bend. Rigidity in the cleaner will make the tongue susceptible to nicks. Higher the flexibility, better is the tongue cleaner. The shape of the tongue cleaner Must be non-gagging. The arms must progressively get wider apart. This ensures comfort while cleaning and optimum surface area coverage with each stroke.