The infraorbital space is located below the eye socket, and infraorbital space infections generally have the following three sources: 1. Most infraorbital space infections come from purulent inflammation of the root tips of the maxillary anterior teeth or premolar teeth or from alveolar abscesses; 2. The pus from osteomyelitis of the maxilla breaks through the periosteum and spreads to the infraorbital space and causes an infection; and 3. Purulent inflammation of the base of the upper lip or around the nose spreads to the infraorbital space. Infection of the infraorbital space often spreads to the infraorbital region, which is red and edematous, and abscess formation creates a more pronounced fluctuating sensation in the infraorbital region. The vestibular sulcus in the region of the upper front teeth in the mouth is often markedly swollen, painful on pressure, and easily palpable with a fluctuant sensation. In some cases, the abscess may break down in the vestibular sulcus and pus may flow out of the broken mouth with varying degrees of pain.