Generally speaking, there are two main types of dental infections. An infection that occurs above the gums can be caused by trauma to the gums, improper brushing, and even food becoming lodged between the gums and the teeth. Another type of infection is a periapical/periradicular abscess that forms underneath or around a tooth at its root and is often caused when a tooth’s pulp (or nerve) is severely decayed and infected. In either instance, the infection should be carefully cleared to prevent further problems to your child’s oral health.