Juices vs. Your Teeth. It is important to consume adequate amounts of fruits and vegetables. These food groups provide vital nutrients that allow your body to function at its best. Multiple studies have shown that orange juice, lemon juice and grapefruit juice all can be acidic and harmful to your teeth. It is possible for these acids to harm not only your teeth but dental restorations as well. These fruits are important parts of your overall diet but limiting the amount of citric juice intake to once or twice a day is recommended. In our office we recommend you avoid sipping on acidic liquids all day long. Using a straw to avoid contact with the teeth and gently rinsing your mouth with water after drinking acidic juices is a way to reduce your risk. This way you can keep your smile looking healthy for years to come.