Oral Ulcers: Clinical features, Causes & Treatment

Traumatic ulcers in healing stage caused by sharp teeth

An ulcer is a tissue defect which has penetrated the epithelial-connective tissue border, with its base at a deep level in the submucosa, or even within muscle or periosteum. An ulcer is a deeper breach of the epithelium than an erosion or an excoriation, and involves damage to both epithelium and lamina propria.