An infected tooth may look darker than the teeth around it. The gum nearby may look swollen, red, or shiny, and some people notice a small pimple-like bump on the gum near the root.
Not every painful or discolored tooth is infected, and some infections are not obvious just by looking. Still, visible changes can point to a problem inside the tooth or around the root that needs prompt dental care.
North Atlanta Center for Cosmetic & Implant Dentistry in Buford, Georgia provides emergency dentistry services and can evaluate teeth that may be infected.
A tooth infection often starts below the surface, but it can cause changes you can see in the mouth. One of the most common signs is swelling in the gum near one tooth, especially if that area feels tender or full.
Other visible changes may include:
Pain is also common, but it is not always constant. Some infections cause throbbing pain, while others mainly hurt when you chew, touch the tooth, or drink something hot or cold.
Most tooth infections begin when bacteria enter the inner part of the tooth, called the pulp. The pulp contains nerves and blood vessels, and infection there can build pressure inside the tooth and spread toward the root.
Often, this starts after untreated tooth decay. As the nerve tissue becomes damaged, the tooth may darken over time.
The surrounding gum may swell because the body is reacting to bacteria and inflammation around the root tip. If the infection finds a path to drain, a bump may appear on the gum, often called a gum boil or fistula.
A cavity can cause a hole, dark spot, or food trap without becoming a true tooth infection yet. If you want to catch decay early, read our article on signs of cavities.
Simple decay may be treated with fillings instead of a root canal. Learn more about cavities and fillings.
Gum disease can also make the gums red, swollen, and prone to bleeding. However, that pattern often affects several teeth instead of one isolated area.
A tooth that has been hit may turn dark without an active infection. Sinus pressure, clenching, or a cracked tooth can also mimic infection because they may cause pain with biting or pressure.
That is why appearance alone is not enough. A dentist may need an exam and X-rays to tell whether the problem is decay, trauma, gum disease, a crack, or an infection at the root of the tooth.
The goal of treatment is to remove the source of infection and protect the surrounding bone and gum tissue. If the tooth can be saved, root canal treatment is often the best option.
A root canal removes infected tissue from inside the tooth and seals the space. If the tooth is too damaged to restore, tooth extraction may be the safer choice to control the infection and prevent it from spreading.
In some cases, a dentist may also need to drain a localized abscess. When a root infection continues after treatment, endodontic surgery can sometimes treat the infection at the tip of the root and help save the tooth.
Treatment timing matters. Waiting can allow the infection to spread into the jaw, face, or nearby spaces, which can make care more complex.
An infected tooth may feel tender, throbbing, or unusually sensitive to pressure. Some people notice pain that wakes them at night, while others mainly notice swelling, a bad taste, or a feeling that the tooth sits higher when they bite.
At the visit, the dentist will usually examine the tooth, test the area gently, and take X-rays. This helps show deep decay, bone loss, or a shadow near the root that may suggest infection.
If pain is your main symptom, a visit can help your toothache. From there, the next step depends on the condition of the tooth and the surrounding tissue.
A good dental team should explain the findings clearly. That includes the benefits and limits of saving the tooth versus removing it.
Some tooth infections need same-day dentistry or emergency dentistry, and a few need emergency medical attention. Facial swelling that is getting worse, fever, swollen lymph nodes, or pus drainage can mean the infection is progressing.
If you are unsure which symptoms need immediate attention, check our guide to signs of trouble.
Seek urgent care right away if you have trouble swallowing, trouble breathing, severe jaw stiffness, or swelling that spreads into the cheek, eye area, or floor of the mouth. These symptoms can point to a deeper infection that should not wait.
Even without dramatic swelling, persistent tooth pain, a darkening tooth, or a recurring gum bump deserves evaluation. Early treatment is usually simpler, more comfortable, and more likely to preserve the tooth.
A dental evaluation is a smart next step if a tooth looks darker than the rest, the gum is swollen in one spot, or there is a recurring bump that drains. The same is true for pain with chewing, lingering sensitivity, or bad breath that seems to come from one area.
People often hope these symptoms will go away on their own, but that is not a safe assumption with a possible infection. If the cause is unclear, worsening, or severe, a dentist can determine what is happening and whether the tooth can still be saved.
If you are noticing changes that match what an infected tooth can look like, scheduling an exam soon is the most reliable way to get answers and avoid a more serious problem later.
North Atlanta Center for Cosmetic & Implant Dentistry in Buford provides emergency dentistry for Buford and nearby areas; call (770) 932-1115 to schedule.
Yes. Some tooth infections cause pain or deep pressure without obvious visible changes. That is one reason X-rays and an exam are often needed.
No. A gum bump can have several causes, including irritation or gum disease. But if it keeps coming back, drains, or appears near a painful tooth, it should be checked promptly.
Not always. Some infected teeth cause severe pain, while others mainly cause swelling, a bad taste, or discoloration. A lack of pain does not rule out infection.
Often, yes. If the tooth structure is restorable and the infection is treated in time, root canal treatment may save it. In other cases, extraction may be the better option.
