The document lists five foods that are good for dental health: onions, which contain properties that neutralize bacteria and make gums healthy; tea, which contains polyphenols that reduce mouth bacteria and toxins as well as fluoride for strong teeth; garlic, whose allicin fights bacteria and protects against decay and gum disease; strawberries, which contain vitamin C, antioxidants, and malic acid to whiten and strengthen teeth; and leafy greens, another source of vitamin C and antioxidants that promote dental health.