REASON FOR THE MOUTH GETTING ULCER AFTER EATING SUGARCANE:
This is the problem caused by eating the sugarcane by biting. There is no connection between sugarcane juice and the mouth ulcer. When we drink sugarcane juice, we are not getting mouth ulcer.
There is a portion of fiber in the sugarcane. When we bite and taste it, the residues of the fiber after release of the juice, breaks into small minute particles and pricks on the tongue and cause injury. The tongue which has injury when we eat hot food cures only after 2 or three days. Likely, the injury caused by the sugarcane fiber cures automatically. But if you drink water before the injury cured, pain is caused by the water touching the injury. We assume this wrongly that injury is caused, when sugarcane is tasted.