The presence of white colored open sores in the mouth dreads every one because it simply indicates you cannot eat anything or even drink anything properly for the next few days. Known as mouth ulcers, these sores are caused by constipation, acidity, hormonal changes, certain foods, stress and accidental bites. Deficiency in essential vitamins C and B complex as well as iron also make you more prone to mouth ulcers. You should consult your doctor as soon as mouth ulcers appear as they may also caused by herpes simplex virus. Here are some efficient home remedies for mouth ulcers.