The simplest way to tell gingivitis from periodontitis is whether the damage has reached the bone. Gingivitis is inflammation limited to the gum tissue itself, and it’s fully reversible. Periodontitis means that inflammation has spread deeper, destroying the bone and ligaments that hold your teeth in place. That destruction is permanent. Nearly 47% of U.S. adults over 30 have some form of periodontitis, so this isn’t a rare diagnosis reserved for people with terrible hygiene.
What Gingivitis Looks and Feels Like
Healthy gums are pink and firm. With gingivitis, the margins along your teeth turn red, puffy, and sometimes shiny. The tissue may feel tender, and you’ll likely see blood on your toothbrush or floss. These are the hallmark signs, and for many people, bleeding while brushing is the very first clue.
Importantly, your gums usually stay at their normal height during gingivitis. Teeth don’t feel loose, and you probably won’t notice any shifting. The inflammation is sitting on the surface, irritating the tissue but not yet eating into the structures underneath. Mild gingivitis can improve within 10 to 14 days of a professional cleaning combined with consistent brushing and flossing at home.
What Periodontitis Looks and Feels Like
Periodontitis shares some symptoms with gingivitis (bleeding, redness, tenderness) but adds a set of more alarming signs. Gums start to pull away from the teeth, creating deeper pockets where bacteria collect. You may notice your teeth look longer than they used to, or that your gum line has become uneven. The color of the tissue often shifts from red to a darker, almost purplish tone.
As the disease progresses, teeth can loosen, shift position, or become painful to chew on. Persistent bad breath that doesn’t go away with brushing is another common sign. These changes reflect what’s happening below the surface: the bone that anchors your teeth is being broken down by chronic inflammation. Once that bone is lost, it doesn’t grow back on its own.
The Key Difference: Bone Loss
The dividing line between gingivitis and periodontitis is bone destruction. In gingivitis, bacteria in dental plaque trigger an immune response that inflames the gum tissue, but the underlying bone stays intact. When that inflammation persists long enough, it begins to break down the periodontal ligament (the connective tissue attaching the tooth to bone) and the bone itself. That transition marks the shift to periodontitis.
Bone loss is typically detected through dental X-rays. Early changes show up as a fuzzy or irregular edge along the bone between teeth. Over time, this progresses to wedge-shaped areas of missing bone, and eventually to a visible drop in bone height around affected teeth. One important caveat: X-rays only reveal bone loss after a significant amount of destruction has already occurred, which is one reason regular dental visits matter even when your mouth feels fine.
How Your Dentist Measures the Damage
During a periodontal exam, your dentist or hygienist slides a thin probe between each tooth and the gum to measure pocket depth in millimeters. Healthy pockets are 1 to 3 mm deep. If any pocket measures 4 mm or more but stays under 6 mm, that suggests moderate periodontitis. A pocket of 6 mm or deeper indicates severe disease.
They also check for bleeding when the probe touches the gum. In clinical terms, gingivitis is classified as localized when 10% to 30% of sites bleed and generalized when more than 30% bleed. You won’t be calculating these percentages yourself, but this is why the exam involves probing around every single tooth rather than just a quick glance.
Periodontitis is staged from I to IV based on how much bone has been lost relative to the length of the tooth roots, how deep the pockets are, whether teeth have already been lost to the disease, and how complex treatment would be. It’s also graded A through C based on how fast the disease is progressing: slow, moderate, or rapid. Your dentist uses this framework to decide how aggressively to treat it.
What You Can Check at Home
You can’t diagnose yourself with the precision of a dental probe and X-ray, but certain signs strongly suggest one condition over the other.
- Bleeding only when brushing or flossing, with no other symptoms: likely gingivitis, especially if your gums still sit snugly against your teeth.
- Gums pulling away from teeth or teeth appearing longer: a sign of recession, which points toward periodontitis.
- A tooth that feels loose or has shifted position: this means supporting bone has been lost. That’s periodontitis.
- Persistent bad breath or a bad taste that won’t resolve: bacteria trapped in deep pockets often produce this, suggesting the disease has moved beyond the gum surface.
- Pus between a tooth and the gum line: a clear sign of active, deeper infection.
If your symptoms are limited to occasional bleeding and mild redness, there’s a good chance you’re still in the gingivitis stage. If you’re seeing recession, loose teeth, or gaps forming between teeth that weren’t there before, the disease has almost certainly progressed.
Who Progresses Faster
Not everyone with gingivitis goes on to develop periodontitis, and certain factors dramatically increase the risk. Smoking has a dose-dependent effect on the gums, meaning the longer you’ve smoked and the more you’ve smoked over your lifetime, the worse the damage. Research measures this in “pack years” (packs per day multiplied by years of smoking), and higher pack years correlate with more severe disease.
Diabetes is the other major accelerator. People with type 2 diabetes develop periodontitis at roughly three times the rate of people without diabetes, and the combination of smoking and diabetes is worse than either one alone. Age plays a role too: among adults 65 and older, about 70% have periodontitis. Other risk factors include obesity, cardiovascular disease, and osteoporosis.
What Happens After Diagnosis
If you have gingivitis, treatment is straightforward. A professional cleaning removes the plaque and tartar buildup that’s driving the inflammation, and a consistent home routine of twice-daily brushing and daily flossing allows the gums to heal. Most people see noticeable improvement within two weeks.
Periodontitis requires more involved treatment. The first step is usually a deep cleaning called scaling and root planing, where tartar is removed from below the gum line and the root surfaces are smoothed so gums can reattach more easily. Depending on the stage, you may need follow-up visits every three to four months instead of the standard six. More advanced cases involving deep pockets, significant bone loss, or loose teeth may require surgical procedures to access and clean the roots, rebuild lost bone with grafting materials, or reshape the gum tissue.
The critical thing to understand is that periodontitis treatment aims to stop the disease from getting worse and preserve what bone you still have. It doesn’t regenerate everything that’s been lost, which is exactly why catching it early, ideally while it’s still gingivitis, makes such a significant difference in long-term outcomes.