This article is general information for our patients, not a diagnosis. If something in your mouth hurts, changes, or worries you, have it examined.
Gums rarely ache the way a bad tooth does, so a little blood in the sink or some puffiness is easy to wave off. That blood is often the only early warning you get, and it’s easy to underestimate what sits behind it: gum disease is responsible for a large share of adult tooth loss, and roughly half of adults over 30 already have some form of it.
So what causes it? The trigger is simple to name: plaque, the soft, sticky film of bacteria that collects along the gumline every day. What differs from person to person is how fiercely the gums react — smoking, diabetes, and your genes can turn a common problem into a serious one. Here’s how I read it with patients, as part of our Adult Patient Information library.
A caveat comes before the warning signs, because it shapes how you should read them. None of these signs stages your gum disease by itself. Bleeding or a shrinking gum margin flags that something is wrong, but how far it has actually gone is a question only the measurements answer — the probing depths around each tooth, whether those spots bleed under the probe, and what an X-ray reveals of the bone beneath. A symptom is a prompt to get measured, never a stage on its own; that assessment happens in the chair, not at the mirror. Use this to understand your gums and judge whether to come in, not to reach a verdict.
The two stages
Gum disease is a bacterial infection that inflames the gums and, if it spreads, slowly destroys the bone that holds your teeth in place. It comes in two stages.
The first is gingivitis — inflammation of the gum surface, driven by that daily plaque along the gumline. Plaque is a living layer (a biofilm) that re-forms within hours of brushing, not the trapped food people picture. Left undisturbed, the body treats it as an infection: gums turn red, puffy, and quick to bleed. Gingivitis is usually reversible — in a well-known experiment, healthy volunteers who stopped cleaning their teeth developed it within two to three weeks, and it cleared once they brushed again.
The second is periodontitis, where the infection moves below the surface and breaks down the deeper anchors — the fibres and bone that hold each tooth — as plaque hardens below the gumline. That damage isn’t reversible: we can usually stop it and hold it stable, but bone that’s gone doesn’t grow back. Not everyone with gingivitis progresses, and we can’t predict who will, which is why I take recurring bleeding seriously rather than wait to find out.
| Gingivitis (early) | Periodontitis (advanced) | |
|---|---|---|
| What’s affected | The gum surface only | The gum, fibres, and bone |
| Bleeding | Common when brushing or flossing | Common, but masked if you smoke |
| Pain | Usually none | Usually none until late |
| Reversible? | Yes, with good cleaning | No — lost bone doesn’t return |
| Aim of treatment | Clear the inflammation | Stop the damage, hold it stable |
The warning signs to catch early
The earliest sign is gums that bleed when you brush or floss; later ones include bad breath, receding gums, and loose teeth. They’re easy to spot once you know them — and just as easy to explain away. Run through this:
- Bleeding when you brush or floss. The one most people dismiss. Healthy gums don’t bleed when you clean them properly; bleeding is inflammation telling you plaque is sitting where it shouldn’t. If this is your main worry, I go deeper into why gums bleed when you brush in its own guide.
- Red, puffy, or tender gums instead of firm and pale pink.
- Bad breath or a bad taste that brushing doesn’t shift.
- Gums that look like they’re shrinking back, so teeth seem longer — this is gum recession, and it often exposes the sensitive root.
- Black triangles or new gaps opening between teeth.
- Teeth that feel loose, or have drifted or changed how they bite together.
Early on you’ll usually see only the first sign or two and no pain; looseness, drifting, and shrinking gums tend to mean the disease has been at work a while. One clue I weigh carefully: if you smoke, your gums may bleed far less even when disease is active, because smoking cuts the blood flow to them — so they can look deceptively healthy while bone is lost underneath. Spotting even one of these is reason to have your gums measured. Measuring is quick: we slide a tiny ruler-like probe into the groove between gum and tooth — 1–3 mm tends to be healthy, while 4 mm and deeper points toward a pocket forming as the gum detaches. On its own that number is one clue; alongside the bleeding, the X-ray, and your history, it starts to mean something.
What raises the risk
Plaque is the trigger, but smoking, diabetes, your genes, and how well you clean between your teeth decide how badly your gums react. Everyone builds plaque; not everyone gets severe gum disease. A few factors stand out:
- Smoking is the biggest risk you can change. Smokers are roughly two to four times more likely to develop periodontitis than people who’ve never smoked, lose bone faster, and respond less well to treatment — and reduced bleeding hides the warning signs. Quitting helps early: after roughly a decade, a former smoker’s risk of losing teeth drifts back toward that of a never-smoker. You don’t regain lost bone, but you stop losing more.
- Diabetes, especially when blood sugar runs high (an HbA1c — the three-month blood-sugar average your doctor tracks — above 7%), makes gums inflame and break down faster, raising periodontitis risk roughly two to three times. It runs both ways: controlling gum inflammation can help blood-sugar control too.
- Genetics. Some people are simply more prone. If close family lost teeth to gum disease, tell me — it changes how closely I watch yours.
- Cleaning between your teeth. Brushing alone misses the surfaces where gum disease starts; daily cleaning between the teeth is the home habit that matters most.
- Age, stress, and some medications play a part too — certain blood-pressure pills, antidepressants, and antihistamines dry the mouth, and less saliva lets plaque build.
How it differs from a cavity
A cavity is a hole in the tooth itself; gum disease attacks the gum and bone around the tooth — different problem, different fix. A cavity (tooth decay) is acid from bacteria dissolving enamel into a hole. Gum disease doesn’t touch the tooth structure at all. You can have perfect, cavity-free teeth and still lose them to gum disease — and the reverse holds too.
| Cavity (tooth decay) | Gum disease | |
|---|---|---|
| What it damages | The hard tooth — enamel and the layer beneath | The gum and bone around the tooth |
| What you’d notice | Sensitivity, a hole, toothache | Bleeding, swelling, bad breath, looseness |
| Hurts early? | Sometimes | Rarely — often silent until advanced |
| Reversible? | Very early softening can; a hole can’t | Gingivitis can; bone loss can’t |
| Main fix | Filling, crown, or root canal | Cleaning below the gumline plus home care |
Why teeth come loose
Teeth aren’t set in the jaw like fence posts in concrete — they’re held by a network of tiny fibres and a socket of bone. Gum disease slowly dissolves that bone, so a tooth has less to hold onto: solid, then slightly loose, then wobbly, until there isn’t enough left. The catch is that losing bone doesn’t hurt — no nerve endings sound an alarm — so it stays hidden until a tooth is loose or a painful, swollen infection (an abscess) flares up. That silence is why I measure gums with a probe at check-ups rather than wait for symptoms: we look for the damage before you can feel it.
How we treat it
Treatment is mechanical, not magic. Gum disease is driven by plaque and hardened plaque (tartar, or calculus), so the core of it is removing those deposits and keeping them off. It usually runs in three parts.
1. Cleaning below the gumline. A thorough clean of the tooth surfaces, including the parts hidden under the gum. Most people call this a “deep cleaning” (you’ll hear us say “scaling”) — cleaning deeper than a routine polish, into the pockets a toothbrush can’t reach. We often numb the area first, and it’s normal for gums to be tender or teeth sensitive for a few days. A course of it typically shrinks pockets by a millimetre or two as the deflated gum tightens back against the tooth and reattaches. One honest warning: as the swelling drops, teeth may look slightly longer and small gaps may appear — the cleaning hasn’t harmed your teeth, it’s uncovered damage the disease had already done. If that makes you anxious, we can talk through options to keep you comfortable.
2. Your daily home care. This does the heavy lifting between visits. Plaque starts rebuilding within hours and is back fully within weeks, so no in-chair cleaning holds without daily cleaning at home. I’ll show you how — this is where good brushing and cleaning between your teeth earns its keep.
3. Keeping it stable. Periodontitis is a long-term condition, a bit like high blood pressure: we can hold it stable, not make it vanish. After the initial clean I re-measure your gums (usually around three months later), then settle into maintenance visits, often every three to six months, for as long as you have teeth. Lifelong visits can sound like a way to keep you coming back, but the evidence is blunt — people who skip periodontal maintenance lose teeth at roughly five times the rate of those who keep up.
Most gum disease is managed this way, without surgery. When the deepest pockets won’t settle, I may refer you to a gum specialist (a periodontist) for surgery that improves access — a normal next step that puts the problem in front of the right tools.
After gum disease: implants or dentures?
Replacing teeth lost to gum disease is usually still possible — what changes is the order. The gum disease has to be controlled first, because implants can develop their own version of it. Place an implant into active infection, or a mouth where plaque still isn’t managed, and you set it up to fail.
That version is peri-implantitis — inflammation that destroys the bone around an implant, just as periodontitis does around a natural tooth. A history of periodontitis, poor plaque control, and skipped maintenance all raise the risk, and it isn’t rare: across studies the milder, reversible form (peri-implant mucositis) affects close to half of implant patients, while peri-implantitis, the bone-losing form, affects roughly one in five. None of that rules out implants — it means an implant needs the same maintenance and home care that protects natural teeth.
Dentures are the other route, and don’t carry that risk, since nothing is anchored in bone — though they bring trade-offs in fit and feel, and a lower denture especially can feel loose at first and may need adjusting as the gum ridge changes shape. I’m a general dentist, and I’ll walk you through which path suits your gums, bone, and daily life — our guide to replacing missing teeth covers both.
How to book a check-up
Booking is one phone call — 705-721-9229 — or, for new patients, one click: book your first visit online. Either way, we’ll find you a time to have your gums examined and measured. Early gum disease is far easier to turn around than the late kind, so if your gums bleed, look like they’re shrinking, or just don’t feel right, don’t put it off.
Prefer to write? Reach us through our contact page. We’re here in Barrie and happy to take a look.
