Use fluoride mouthwash after meals
Rinse your mouth out with a fluoride mouthwash after meals; this will wash away any food debris and bring the enamel-hardening fluoride into contact with your teeth in the middle of the day. Avoid rinsing with mouthwash after brushing your teeth; toothpaste contains more fluoride than mouthwash does; if you rinse with mouthwash, the new actually reduces the amount of fluoride in contact with your teeth. More.