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What are canker sores? Canker sores (also called aphthous ulcers) are different than fever blisters. They are small, red or white, shallow ulcers occurring on the tongue, soft palate, or inside the lips and cheeks; they do not occur in the roof of the mouth or the gums. They are quite painful, and usually last 5-10 days.
Sore palate or sores on roof of mouth is one such condition in which the Palate becomes sore or inflamed resulting in them not working properly. Anatomically speaking, there are two types of palate which are the hard palate and the soft palate. The hard palate forms the front part of the roof of our mouth.