Kissing provides several health benefits according to science. It can boost immunity by exposing partners to each other's bacteria and triggering antibody production, bust stress by releasing oxytocin, endorphins, and dopamine, and ease allergies by slowing histamine production. Kissing also produces extra saliva that helps neutralize acids, wash away plaque, and may strengthen enamel, making it good for oral health. It is also a light workout that burns calories and engages facial muscles.