Harte Dental: Did You Know lemon water has its health benefits such as providing vitamin C, aiding in digestion, and giving you that “full feeling.” But while that citric acid stimulates your stomach acids, it also erodes your tooth enamel when it is contact with your teeth for long durations. Try this! Rinse with plain water! The plain water will wash away the acids and help to restore a healthy pH level in your mouth. Also, drinking the lemon water with a straw can slightly reduce exposure to your teeth.