Almost every person would have experienced mouth ulcers at some point of time in their life. I also had mouth ulcers a number of times.
The first thing the doctors will say in such a case is –
Drink plenty of water.
I do not remember that I got complete relief from mouth ulcers by drinking plenty of water within 24 hours.
But I have a number of people who got complete relief by giving up water and all other fluids in 24 hours and less.
For more details check the page on IBS – Irritable Bowel Syndrome on this blog. Keep checking these pages for more comments and feed back from others.