It heals mouth ulcers instantly. You can apply the paste of Manjakani on your ulcer. It is completely safe to be used in case ulcer. Even this can be used on a child.Soak oak gall in water for the while then rub it on the hard surface or stone with little water. It will form a paste and use it on the affected areas for instant relief.You can use the powder of Manjakani as mouthwash. As you already know that it treats mouth ulcers. It has antiseptic properties. Boil the powder Manjakani. Use Luke that warm water as mouthwash. It is very helpful in treating cavities and removes bad odor.