Taking good care of your immune system can help you fight off many illnesses, OC included. Make sure you always get restful sleep, eat fruits and vegetables (a link in some opinions to preventing OC) and try to de-stress as much as possible. And, try not to worry until something or someone directly gives you something to worry about! See your dentist regularly, See your doctor when you 1st notice something odd. My ex-husband waited 9 months to see his doctor about a swollen lymph node.