Mouth ulcers, also known as canker sores or aphthous ulcers, are painful sores that appear on the inside of the mouth, on the lips, or on the tongue. While the exact cause of mouth ulcers is not always clear, several factors can contribute to their development. Here are some common causes and factors associated with mouth ulcers: Trauma or Injury: Accidental biting of the inside of the cheek, tongue, or lip, as well as injuries from rough dental work, braces, or dentures, can trigger the formation of mouth ulcers. Oral Hygiene: Poor oral hygiene, such as inadequate brushing or flossing, can lead to mouth ulcers. Maintaining good oral hygiene practices is important to prevent oral infections and minimize the risk of mouth ulcers. Nutritional Deficiencies: Deficiencies in certain vitamins and minerals, such as vitamin B12, iron, zinc, or folate, may contribute to the development of mouth ulcers. Eating a well-balanced diet that includes a variety of fruits, vegetables, and n...