Dental infections occur when bacteria invade the tissues around the teeth, leading to conditions such as tooth abscesses or periodontal disease. These infections can cause pain, swelling, and redness, and may result in the formation of pus. If left untreated, they can spread to other areas of the body, potentially leading to more serious health issues. Common causes of dental infections include poor oral hygiene, untreated cavities, and gum disease. Symptoms may include a persistent toothache, sensitivity to hot or cold, and swelling in the gums. Prompt treatment by a dentist is essential to prevent complications and restore oral health.