Tooth and gum pain from cavities or tooth holes usually occurs due to infection or nerve irritation inside the tooth. To relieve the pain temporarily, you can rinse your mouth with warm salt water, maintain good oral hygiene, and use a mild pain reliever like Paracetamol after consulting your doctor. Avoid very hot, very cold, or very sweet foods, as they can worsen the pain. However, these are only temporary measures, as cavities require dental treatment, such as cleaning, filling, or root canal therapy, to relieve pain completely and prevent infection from spreading. You should visit your dentist as soon as possible for proper evaluation and treatment.