Pennant Bio-patent is selected from Lactobacillus rhamnosus F-1 strain, Lactobacillus salivarius AP-32 strain, Lactobacillus reuteri GL-104 strain, Lactobacillus paracasei ( Lactobacillus paracasei GL-156, Lactobacillus helveticus RE-78, Lactobacillus rhamnosus CT-53 and Lactobacillus paracasei ET-66, at least An isolated lactic acid bacteria strain is a lactic acid bacteria food, oral cleanser and pharmaceutical composition. By developing existing functional probiotics, it provides a new solution to inhibit the growth of pathogenic bacteria in the oral cavity, whiten teeth, and improve bad breath.