Dental infections may sound sudden and severe, but they usually begin in a simple and preventable way. Harmful bacteria in the mouth feed on food particles left on teeth, gradually leading to plaque buildup and, if untreated, serious infections such as abscesses.
How Plaque Forms on Teeth
Bacteria naturally live in the mouth. When food particles—especially sugars and starches—remain on teeth, bacteria feed on them and begin to multiply. As they grow, they form a sticky biofilm known as dental plaque, which adheres to the surface of the teeth.
How Bacteria Cause Tooth Decay
As plaque bacteria break down food, they produce acid as a byproduct. This acid attacks the tooth’s outer protective layer, called enamel. Over time, repeated acid exposure weakens and erodes the enamel.
Once the bacteria break through the enamel, they reach the next layer of the tooth, known as the dentin, which is softer and more vulnerable to decay. This allows the infection to spread more quickly toward the center of the tooth.
When Infection Reaches the Pulp
At the core of each tooth is the pulp, which contains nerves and blood vessels. When bacteria reach this area, they trigger inflammation and infection called pulpitis. This stage often causes significant pain and sensitivity.
To save the tooth at this point, a root canal procedure is typically required to remove the infected pulp and seal the tooth.
From Pulpitis to Abscess
If the infection is left untreated, the pulp tissue can die—a condition known as necrosis. The dead tooth then becomes a breeding ground for bacteria. As the body’s immune system responds, pus accumulates at the tip of the tooth’s root, forming a dental abscess.
Dental abscesses are serious infections that can cause swelling, pain, fever, and can spread to other parts of the body if not treated promptly.
Preventing Dental Infections
The good news is that this entire process is largely preventable. Regular dental cleanings, good oral hygiene, and early treatment of cavities can stop bacteria long before they reach the pulp or cause an abscess.
If you notice tooth pain, sensitivity, or swelling, seeing a dentist early can help prevent more serious complications.