Why Do Back Teeth Get Infected?

Because molars are harder to reach and clean, they’re more vulnerable to infection. With today’s latest technology and same-day treatment options, we can restore a back tooth quickly and comfortably, often in just one visit.” – Dr. Ashton Fjeldheim Neighborhood Dental East 26

Why Your Back Teeth Matter

Your molars and premolars, those hardworking back teeth, do most of the chewing but often take the hardest hits when it comes to dental health. Because of their shape and position, they’re more likely to develop decay and infections.

At Neighborhood Dental, with 8 convenient locations across South Dakota, we see this often, and that’s why we focus on prevention, early detection, and advanced treatment. With our modern, state-of-the-art technology and patient-focused approach, we make every visit simple, efficient, and comfortable while protecting your long-term oral health. All of our offices use digital X-rays because they have significantly less radiation than traditional film-based X-rays, plus the results are instant. Keep reading to find out why infections begin, common tooth infections our dentists see, warning signs, and how our team of dental experts helps protect your smile for years to come.

Why Infections Often Begin in the Back Teeth

1. Complex Anatomy
   Molars have deep grooves and multiple roots that make them great for grinding food, but also prime areas for bacteria to hide. These complex shapes can be tough to clean at home, even with careful brushing.
2. Hard-to-Reach Location
   The further back your teeth are, the harder it is to brush and floss them properly. Plaque buildup is more likely to remain, and over time, this can lead to decay and infection.
3. Extra Wear and Tear
   Your back teeth absorb most of the chewing pressure. Tiny cracks or weakened enamel can develop, creating openings for bacteria to enter and cause infection.
4. Delayed Treatment
   Many patients wait to address discomfort in their back teeth until pain is severe. By that point, the infection may have spread and require more advanced care.

Common Tooth Infections in the Back of the Mouth

Dental Abscess

• Occurs when bacteria enter the pulp (nerve and blood supply) inside a tooth, often through deep decay, cracks, or trauma.
• The infection spreads to the root tip, forming a painful pocket of pus in the bone.
• More common in molars since their anatomy and chewing forces make them more prone to decay and fractures.

Periodontal Abscess (Gum Infection Around the Tooth)

• Caused by advanced gum disease, where bacteria and plaque collect deep under the gumline.
• Leads to swelling, redness, and pain near the roots of back teeth.
• Often worsens in areas that are more difficult to clean, such as behind the molars.

Pericoronitis (Infection Around Wisdom Teeth)

• A frequent infection in the very back of the mouth, usually affecting partially erupted wisdom teeth.
• Food and bacteria get trapped under the gum flap covering the tooth, leading to pain, swelling, and sometimes difficulty opening the mouth.

Root Canal Infections in Molars

• Molars often have multiple roots and canals, making them harder to treat and easier for bacteria to remain hidden if not fully cleaned.
• These infections may cause persistent pain, swelling, and even spread to nearby tissue if untreated.

Osteomyelitis (Bone Infection from Tooth Abscess)

• A less common but serious complication is when untreated molar infections spread into the jawbone.
• Causes severe pain, fever, and swelling, and requires urgent dental treatment.

Warning Signs of a Tooth Infection

You can catch oral health problems early by looking out for:

• Consistent or throbbing toothache
• Swelling in your gums, cheek, or jaw
• Sensitivity to hot or cold foods
• Bad taste or bad breath in your mouth
• Trouble chewing or biting down

If you notice these symptoms, don’t wait. Call your nearest Neighborhood Dental location right away. Our team of skilled hygienists and doctors is here to keep your smile healthy and shining bright.

How Your Local Dentists Help Protect Your Back Teeth

At Neighborhood Dental, your comfort and oral health are our top priorities. All of the locations are equipped with modern technology that makes dentistry easier, faster, and more comfortable. Here’s how we help:

• Comprehensive Exams & Digital Imaging: Our advanced imaging and diagnostic tools enable us to detect cavities and infections early, sometimes before you even experience symptoms. Digital X-rays use up to 80–90% less radiation than traditional film X-rays, making them much safer for patients.
• Gentle Cleanings & Preventive Care: Professional cleanings (including deep cleanings for those that need scaling and root planing treatment), sealants, and fluoride treatments protect hard-to-reach areas on your molars.
• Same-Day Restorations: With CEREC same-day crown technology, we can restore damaged or cracked back teeth in just one visit.
• Comfort Menu Amenities: From massage chairs to headphones and blankets, we make your visits stress-free and relaxing. Read more: Our teams are actively committed to your comfort.
• Advanced Treatment Options: If an infection develops, our dentists provide expert care, whether it involves root canal therapy to save the tooth or a tooth extraction when necessary.

A Simple Step Toward a Healthy Smile

Our teams like to remind patients that your mouth isn’t separate from the rest of your body; it’s the gateway to it. Bacteria that lives in your mouth doesn’t just cause cavities or gum disease; they can enter the bloodstream, trigger inflammation, and even affect your heart, lungs, and other organs. A 2016 analysis of periodontal disease research found that gum disease may be linked to 57 chronic conditions, including diabetes, cardiovascular and liver diseases, as well as preterm births.

That’s why oral health is directly connected to overall health.

Neglecting dental issues, especially in the back teeth where infections often start, can lead to bigger problems than a toothache. Back teeth are prone to infections, but they don’t have to be. As your rated #1 local best dentists, our teams prioritize your comfort, prevention, and long-term health. Protecting your smile has never been easier.

Schedule your visit today at the Neighborhood Dental location nearest you—and let us help keep your smile healthy, comfortable, and strong.

As your local best dentistThis link opens a new tab to The Local Best website in South Dakota, Neighborhood Dental has multiple locations for your convenience, including Sioux Falls, Harrisburg, Brandon, Tea, Beresford, and Yankton. We happily welcome patients of all ages.