It may not be as effective as flossing and brushing, but kissing increases saliva flow, which helps prevent tooth decay.
Kissing is nature's natural cleansing process. According to the Academy of General Dentistry, kissing stimulates saliva, which washes out the mouth and helps remove the cavity-causing food particles that accumulate after eating. Saliva's mineral ions can even promote repair of small lesions in tooth enamel.
Of course, more than a good-night kiss is needed to protect teeth — keep up your daily dental hygiene regimen. And always brush and floss before going to bed, since sleep slows the production of saliva.
No one to kiss? Get saliva flowing by chewing sugarless gum.