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A teeth stain cleaner - Teeth stain and discoloration may remain even after brushing teeth. Micron-pressed melamine foam is designed to remove tough stains on teeth surface. Put water on a pressed melamine foam tip and remove stains by rubbing off. In dental enamel (teeth surface) there are numberless micro-pores and stains may be trapped inside these micro-pores. Since bristles of toothbrush and particle size of toothpaste are larger than diameter of a micro-pore, they cannot remove stains cleanly. However, the fibre of micron-pressed melamine foam is smaller than its diameter, and it is easy to remove stains even inside these micro-pores without abrading. It is formalin free and safe to use.