Probiotic ENT Defend is a chewable, pleasant tasting strawberry chewable that activates in the oral cavity for support of ear,nose and throat health. As you chew, Probiotic ENT Defend releases the Bacterium strain of Streptococcus salivarius, a beneficial and needed bacterium that normally occurs in a healthy oral cavity. S. salivarius adheres to cells in the cavity and positively affects the bacterial population and natural immune defenses.