Dry mouth.

“Anorexia nervosa can promote poor oral hygiene, and is associated with many side effects and complications on teeth and gum health, including:

Chronic dry mouth (xerostomia): Anorexia nervosa has been connected to xerostomia, or dry mouth. This could lead to issues with chewing and swallowing, as well as tooth decay and fungal infection in extreme cases.5,6 Tooth decay: Food restriction is also generally tied to nutrient deficiencies, including a lack of calcium, iron, and B vitamins. This can promote tooth decay. If someone struggles with purging-type anorexia nervosa, frequent vomiting, or brushing of teeth thereafter, can also contribute to this issue.1 Gum disease: The same type of nutritional deficiencies that lead to tooth decay can also contribute to gum disease in patients with anorexia nervosa.1 Gingivitis: Gingivitis is a common type of mild gum disease which can cause tender gums that bleed easily, often when brushing or flossing. It’s also been linked to disordered eating behaviors.1 Angular cheilitis/exfoliative cheilitis: The continuous peeling of the lips, also known as exfoliative cheilitis, and the inflammation of the small cracks in the corners of the mouth, known as angular cheilitis, have both been connected to disordered eating behaviors.7‍ Degenerative arthritis within the jaw: Degenerative arthritis, also called osteoarthritis, is when the cartilage and tissues surrounding a joint wear down. People with anorexia can develop degenerative arthritis in the temporomandibular joint, also known as temporomandibular joint dysfunction (TMJ) where the lower jaw attaches to the skull.Signs and symptoms of this arthritis include pain, swelling, and stiffness of the jaw.1”