How do I get rid of mouth ulcers How do I get rid of mouth ulcers Too much water or too much salt can cause mouth ulcers. If one is drinking more than 2 liters of water in 24 hours for some time, do not drink water for 15 to 36 hours till mouth ulcers are completely healed. However in case of multiple health conditions do not try this without consulting your doctor. Main cause is fluid and...