Catechin efficacy and effect of scavenging free radicals, prevention of tooth decay, antibacterial, deodorant, change the distribution of intestinal microorganisms. 1. Scavenging free radicals: catechins are natural oils and fats antioxidants, but also scavenging free radicals produced by the human body, to protect cell membranes. 2. Preventing tooth decay: Clinical experiments show that catechins can significantly reduce dental plaque and alleviate periodontal disease, which is helpful in preventing tooth decay. 3. Antibacterial: catechins can inhibit the germs of human skin diseases, and have a certain effect on the treatment of eczema. 4. Deodorization: catechins can remove the odor of methyl mercaptan, can also remove the smoker’s bad breath, but also can reduce pigs, chickens and human excreta issued by the odor. 5. Change the distribution of intestinal microorganisms: catechins can inhibit human pathogenic bacteria such as Clostridium botulinum, and will not affect the reproduction of beneficial bacteria such as lactobacilli, thereby improving intestinal function.