Coconut milk is a good medicine for ulcers. Extract milk by grating fresh coconut. Now gargle with this coconut milk for about three to four times a day. Coriander leaves boiled in water are one simple remedy for mouth ulcers. Let the water cool down and gargle lukewarm water for at least 3 to 4 times a day and notice better results. Gargle with one glass of cold /chilled water and one glass of lukewarm water alternatively. This procedure will cure the mouth ulcers effectively.