The oral cavity is under constant bombardment from foods and drinks, as well as substances such as alcohol, tobacco products and nicotine, dental materials and much more. Bacteria and other disease-causing agents along with systemic conditions present further insult. Because the oral tissues are delicate, they are especially vulnerable to cell damage caused by free radicals and oxidative stress.
Maintaining a good balance of oxidants and antioxidants is very essential for maintaining oral health. Factors such as pollutants, alcohol, nicotine , substances used in dental procedures can disturb the balance of oxidants in oral tissues. Antioxidants help to offset this imbalance.
Link 1: Antioxidants in oral healthcare