Periodontology is the branch of dentistry focused on the structures that surround and support your teeth, collectively called the periodontium. It covers the prevention, diagnosis, and treatment of diseases affecting the gums, bone, and connective tissues that hold teeth in place. The field is more relevant than most people realize: 42.2% of American adults aged 30 and older have some form of periodontitis, and that number climbs to nearly 60% for adults 65 and older.
The Four Tissues of the Periodontium
The periodontium is made up of four distinct tissues, each with a specific job in keeping your teeth stable and protected.
Gingival tissue is the pink gum tissue you can see. It forms a seal around each tooth and acts as a barrier against the bacteria constantly present in your mouth. The periodontal ligament is a web of tiny collagen fibers that connects each tooth root to the surrounding bone. Beyond anchoring the tooth, this ligament also functions as a sensor, relaying pressure information to your brain so you can feel the difference between biting into a cracker and biting into a cherry. Cementum is a thin mineralized layer covering the root surface of each tooth, serving as the attachment point for those ligament fibers. Alveolar bone is the ridge of jawbone that houses the tooth sockets. Together, these four structures support the tooth, protect it from bacteria, and make the physical connection between tooth and bone possible.
Gingivitis vs. Periodontitis
Periodontal disease exists on a spectrum, and the distinction between its two main forms matters because one is reversible and the other is not.
Gingivitis is the early stage. Bacteria naturally living in the gum crevice multiply and trigger inflammation, causing red, swollen, or bleeding gums. At this point, no permanent damage has occurred. With proper cleaning and care, gingivitis resolves completely.
Periodontitis is what happens when gingivitis goes unchecked. The gums begin pulling away from the teeth, creating deepening pockets. Bone loss starts, and if those gaps become large enough, teeth loosen and can eventually fall out. The bone destruction that defines periodontitis cannot be fully reversed on its own, which is why early detection is a central goal of the field.
How Gum Disease Destroys Bone
The damage in periodontitis isn’t caused directly by bacteria. It’s caused by your own immune system overreacting to them. When bacterial communities in the gum crevice shift from a balanced state to an imbalanced, disease-promoting one, the body sends waves of immune cells to fight the infection. These immune cells release enzymes and toxic molecules that break down the surrounding connective tissue. Over time, they also trigger specialized bone-dissolving cells to activate, leading to the progressive loss of the jawbone that supports your teeth.
If the inflammation isn’t resolved, the immune response becomes self-sustaining. The initial defenders give way to a more complex network of immune cells that produce a cascade of inflammatory signals, keeping tissue destruction going even as the body attempts to fight the infection. This is why periodontitis tends to be chronic: the inflammation feeds on itself.
How Periodontists Diagnose Gum Disease
A periodontal exam relies on two primary tools: a periodontal probe and dental X-rays. The probe is a thin instrument inserted gently between the gum and tooth to measure pocket depth in millimeters. Healthy pockets are typically 1 to 3 mm deep. Deeper pockets indicate tissue detachment and possible bone loss. Probes can be manual or electronic, with electronic versions capable of measuring down to 0.1 mm precision.
X-rays reveal the level of bone support around each tooth. Dentists assess bone loss by visual interpretation or digital image analysis, comparing the current bone level against what’s expected for a healthy tooth. Together, probing depth and bone level form the diagnostic standard for periodontitis.
The current classification system assigns periodontitis a stage (I through IV) based on severity, including how much bone has been lost relative to the root length, whether teeth have already been lost to the disease, and how complex treatment will be. A separate grade (A through C) estimates how quickly the disease is progressing, from slow to rapid, with risk factors like smoking or diabetes factored in as modifiers.
Non-Surgical Treatment
The first-line treatment for mild to moderate gum disease is scaling and root planing, often called a deep cleaning. Under local anesthesia, a dentist or hygienist removes plaque and hardened tartar from both above and below the gumline using hand instruments or ultrasonic tools. They then smooth the root surfaces, which helps the gum tissue reattach and makes it harder for bacteria to accumulate again.
The procedure takes one to two hours and may be completed in a single visit or split across two appointments. Antibiotics are sometimes placed directly around the roots or prescribed orally afterward. It’s similar to a routine dental cleaning but reaches much deeper beneath the gums.
Surgical Treatment
When non-surgical cleaning isn’t enough, periodontal surgery provides direct access to the damaged areas. The primary goal is to fold back the gum tissue, remove diseased tissue and bacteria under direct vision, then reposition the gums to reduce pocket depth.
Regenerative procedures go a step further, aiming to rebuild lost bone and tissue. These use bone grafts from various sources (your own bone, donor bone, or synthetic materials), barrier membranes that guide new tissue growth into the right areas, or growth factors that stimulate healing. Research comparing standard flap surgery with procedures that include tissue grafts has shown better outcomes when grafting material is added. In recent years, regenerative techniques have become a common approach for recovering the support structures lost to periodontitis.
Links to Overall Health
Periodontitis doesn’t stay in your mouth. The chronic inflammation it produces spills into the rest of the body through three main routes: imbalanced bacterial communities, a sustained low-grade inflammatory state that elevates inflammatory markers in the blood, and the spread of oral bacteria to distant organs.
One bacterium in particular, commonly found in diseased gums, plays a key role in triggering and maintaining inflammatory responses throughout the body. The systemic conditions linked to periodontitis include diabetes, cardiovascular disease, chronic kidney disease, rheumatoid arthritis, respiratory diseases, adverse pregnancy outcomes, and neurodegenerative diseases. These aren’t just statistical associations. Treating periodontitis has been shown to produce measurable improvements in several of these conditions, particularly blood sugar control in people with diabetes.
What a Periodontist’s Training Looks Like
A periodontist is a dentist who has completed an additional three-year residency program, with a minimum of 30 months of specialized instruction, after dental school. This training covers both the surgical and non-surgical management of gum disease, the placement of dental implants, and cosmetic procedures involving the gums and bone. General dentists treat gum disease regularly, but complex cases, advanced bone loss, or implant placement are typically referred to a periodontist.