Periodontal disease, commonly called gum disease, is the leading cause of tooth loss in adults. But it’s not the only condition that can loosen or destroy teeth. Several systemic diseases, nutritional deficiencies, and even certain medications can set the stage for losing teeth, sometimes in ways that look nothing like typical gum problems. Nearly 1 in 5 adults aged 75 and older in the United States have lost all of their teeth, and understanding the conditions behind that statistic can help you recognize warning signs early.
Periodontitis: The Most Common Cause
Periodontitis is the single biggest reason adults lose teeth. It starts as gingivitis, a milder inflammation of the gums triggered by bacterial buildup along the gumline. At the gingivitis stage, the damage is reversible. Your gums may bleed when you brush, look red or puffy, but no permanent tissue has been destroyed.
The turning point comes when inflammation spreads deeper, reaching the bone that anchors your teeth. Once that happens, the condition becomes periodontitis. Immune cells responding to the infection release enzymes that break down the connective tissue holding teeth in place. At the same time, the inflammation activates a signaling chain that ramps up the activity of bone-dissolving cells while simultaneously suppressing the cells responsible for building new bone. This means the body is not only losing bone around the teeth but is also blocked from repairing the damage. Over months and years, teeth gradually loosen as their foundation erodes.
The progression is typically slow, which is part of the problem. Many people don’t realize the bone loss is happening because pain is minimal until the disease is advanced. By the time a tooth feels noticeably loose, significant structural support has already been lost.
Diabetes and Gum Disease
People with diabetes are three times more likely to develop periodontal disease than those without it. Persistently elevated blood sugar impairs the body’s ability to fight infections and promotes chronic inflammation in the mouth. Higher glucose levels in saliva also create a friendlier environment for harmful bacteria, allowing plaque to build up faster and gum tissue to break down more readily.
The relationship runs in both directions. Gum disease makes blood sugar harder to control, and poorly controlled blood sugar makes gum disease worse. This cycle can accelerate bone loss around the teeth if either condition goes unmanaged. For people with diabetes, consistent oral care isn’t just about dental health; it’s part of managing the disease itself.
Osteoporosis and Jawbone Loss
Osteoporosis weakens bones throughout the body, and the jawbone is no exception. When systemic bone density drops, the upper and lower jaw lose structural integrity and become more vulnerable to the destructive effects of gum disease. Studies comparing patients with and without osteoporosis show that those with the condition experience more tooth loss and more severe bone erosion around remaining teeth.
The risk is substantial: untreated or only briefly treated osteoporosis is associated with a fourfold increased risk of losing teeth. There’s an additional complication worth knowing about. Some medications used to treat osteoporosis, particularly drugs that slow bone breakdown, can in rare cases cause a condition called medication-related osteonecrosis of the jaw, where jawbone tissue dies. This is especially a concern when dental infections are present, which is why dentists often want to evaluate patients before osteoporosis treatment begins.
Scurvy: When Collagen Breaks Down
Vitamin C is essential for producing collagen, the protein that gives structure to gums, the ligaments holding teeth in their sockets, and blood vessel walls. When vitamin C intake drops low enough to cause scurvy (blood levels below 0.2 mg/dL), the body can no longer maintain these tissues. The gums become swollen and hemorrhagic, bleeding easily and pulling away from the teeth. The periodontal ligament, the thin band of tissue that connects each tooth root to the surrounding bone, weakens and eventually fails.
Scurvy is rare in developed countries but still occurs in people with extremely limited diets, those with severe alcohol use disorder, or elderly individuals living alone with poor nutrition. Hippocrates described the hallmark oral symptoms thousands of years ago: gums separating from the teeth and nosebleeds. The good news is that scurvy-related damage can often be halted and partially reversed with adequate vitamin C intake, though teeth already lost won’t grow back.
Sjögren’s Disease and Dry Mouth
Sjögren’s disease is an autoimmune condition in which the immune system attacks the glands that produce saliva and tears. The resulting dry mouth, called xerostomia, creates a perfect environment for tooth decay. Saliva normally washes away food particles, neutralizes acids produced by bacteria, and delivers minerals that help repair early enamel damage. Without enough saliva, bacteria thrive unchecked, and tooth decay can progress rapidly across multiple teeth at once.
People with Sjögren’s often develop cavities at the gumline and on the biting edges of front teeth, areas that are unusual for typical decay. Left unmanaged, this widespread decay can weaken teeth to the point of fracture or require extraction.
HIV and Necrotizing Periodontal Disease
People with significantly weakened immune systems, particularly those with poorly controlled HIV, are vulnerable to a fast-moving form of gum disease called necrotizing periodontitis. Unlike typical periodontal disease, which progresses over years, necrotizing periodontitis destroys gum and bone tissue rapidly. It’s painful, causes visible ulceration and death of the gum tissue between teeth, and is often accompanied by spontaneous bleeding and pus.
This aggressive destruction can loosen teeth in weeks rather than years. With modern HIV treatment keeping immune function stable, necrotizing periodontitis has become less common, but it remains a serious risk for immunocompromised individuals.
Medications That Affect Your Gums
Certain drugs cause the gums to overgrow, a condition called gingival overgrowth. The swollen tissue creates deep pockets between the gums and teeth where bacteria accumulate, increasing the risk of periodontal disease and eventual tooth loss. Three drug classes are primarily responsible:
- Anticonvulsants: Phenytoin, used for seizure disorders, causes gum overgrowth in roughly 50% of adults who take it.
- Immunosuppressants: Cyclosporine, commonly prescribed after organ transplants, triggers the problem in about 30% of users. In kidney transplant recipients specifically, the rate reaches 53%.
- Calcium channel blockers: Nifedipine and amlodipine, prescribed for high blood pressure, cause overgrowth in about 20% of patients.
If you take any of these medications and notice your gums growing over your teeth, more frequent professional cleanings and meticulous daily brushing can help keep the overgrowth in check. In some cases, switching to a different medication resolves the issue.
Oral Cancer and Unexplained Loose Teeth
In rare cases, a tooth that suddenly becomes loose without an obvious cause can signal something more serious than gum disease. Tumors in the jawbone or surrounding tissues, including lymphomas and carcinomas, can destroy bone from within and mimic the appearance of localized periodontal disease. In one documented case, a patient presented with loose upper molars and what appeared to be a standard gum infection, but imaging revealed a poorly defined area of bone destruction and an obliterated sinus cavity, pointing to a tumor rather than gum disease.
The key warning signs that distinguish cancer from periodontitis include tooth loosening with otherwise healthy-looking gums (no redness or bleeding), numbness in the lip or face, unexplained bone destruction visible on X-rays, and general symptoms like persistent fatigue, fever, swollen lymph nodes, or unintended weight loss. A single loose tooth with no clear dental explanation warrants thorough investigation, including imaging and possibly a biopsy.
Early Signs That Teeth Are at Risk
Tooth loss rarely happens without warning. The progression typically moves through recognizable stages. Gums that bleed during brushing or flossing are the earliest and most common signal. Persistent bad breath, gums that appear to recede (making teeth look longer), and teeth that feel slightly different when you bite down all suggest advancing disease. By the time a tooth moves visibly when you press on it with your tongue or finger, significant bone loss has already occurred.
Dentists assess tooth mobility on a simple scale. Slight movement you can feel but barely see is the mildest grade. Visible side-to-side movement of about half a millimeter indicates moderate loosening. A tooth that moves in all directions, including being depressed into the socket, is severely compromised and often cannot be saved. The earlier in this progression that treatment begins, the more options exist for stabilizing teeth and halting bone loss.