Dental abscesses are a sign of infection, within the tooth . If your child is in terrible pain, has trouble eating, has facial swelling, or describes a throbbing feeling near the affected tooth, these are all signs of an abscess. Abscesses can be accompanied by a foul odor or taste as well. The telltale sign of an abscess, though, is a small pimple-like bump on the gums. If you see this, call our office right away to make an appointment.