Mouth sores can be caused by bacterial, viral or fungal infections, a loose orthodontic wire, a denture that doesn’t fit, or a sharp edge from a broken tooth or filling.
A tooth abscess occurs when bacteria invade the dental pulp (the nerves and blood vessels of the tooth). Bacteria enter the pulp and spread to the root. The tight space, within which the inflammation occurs, forces pus into the bone at the tip of the root. The bacterial infection causes pain and inflammation.e tooth. Bacteria enters the pulp and spreads to the root. The bacterial infection causes pain, bad breath and inflammation. The tight space, within which the inflammation occurs, forces pus into a pocket (abscess) at the tip of the root.
The cause is not clearly understood. Some common causes may be: nutritional deficiencies, dry mouth, oral thrush, diabetes, hormonal changes, certain medications, and anxiety or depression.
Thrush is caused by a fungus and typically develops when the immune system is weakened. Some medications, such as steroid or cancer therapies, may increase the risk of developing this infection. Antibiotics also increase the risk of developing candidiasis because they can alter the normal balance of microbes in the mouth.
In some cases, the exact cause of an ulcer is unknown, but trauma or injury to the mouth or oral soft tissues may be the culprit. Other possible causes are viral infections, food sensitivities, spicy, salty or acidic foods, vitamin B deficiency, hormonal shifts and stress.
Cold sores are caused by the herpes simplex virus (HSV)-1 and are highly contagious. The initial infection with the virus can be accompanied by cold or flu-like symptoms and can cause painful oral lesions. There is no cure for the herpes virus. Reoccurrence can occur when an individual has a fever, menstruation, fatigue, stress or exposure to the sun.
These lesions can result from irritations that occur from fillings, crowns or ill-fitting dentures. Other causes include tobacco use, HIV/AIDS and the Epstein-Barr virus. Sometimes, leukoplakia is associated with oral cancer, so it is important to see your dentist if you notice any of these patches developing. Your dentist may recommend a biopsy if the patch appears suspicious.
Sialadenitis a bacterial infection of a salivary gland and can be acute, chronic or recurrent. Pus may drain through the salivary gland into the mouth. These infections occur most often in the parotid gland.