"Wooidang, Inc. is a Korean natural oral care company specializing in gum care and bad breath. Our brand KOYUJI is built on patented pine salt—sea salt fired at 1,000°C in a clay kiln. The lineup: a 6.5% salt toothpaste and a stick salt mouthwash that cuts bad breath by 83%, both Korean-approved quasi-drugs. Alcohol- and surfactant-free, ISO 22716 GMP, exported to the US, Australia, and China.