Periodontitis: Why Your Gums Bleed and Recede, the 4-Stage Disease Path, and How Treatment Saves Your Teeth

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026

TL;DR

Periodontitis is a serious infection of the gums that damages the tissue and bone holding your teeth in place. It usually begins with plaque, a sticky film of bacteria, which hardens into tartar and triggers inflammation that worsens over time. The good news is that it is common but usually preventable, and early treatment can stop further damage. Brushing twice a day, flossing daily, and regular dental cleanings are your strongest defenses. If you notice bleeding gums, receding gums, or loose teeth, see a dentist promptly; the sooner you get care, the better your chances of reversing the damage.

Quick answer

• What it is: A severe gum infection that damages soft tissue and can destroy the bone supporting your teeth.

• Main cause: Untreated plaque that hardens into tartar, leading to chronic gum inflammation.

• Key number: Healthy gum pockets measure 1–3 mm; pockets deeper than 4 mm suggest periodontitis, and pockets deeper than 5 mm cannot be cleaned with routine home care.

• First treatments: Scaling and root planing (deep cleaning below the gumline) plus antibiotics when needed.

• Surgery options: Flap surgery, soft tissue grafts, bone grafting, guided tissue regeneration, and tissue-stimulating protein gels.

• Bottom line: Daily brushing and flossing, tobacco avoidance, and professional cleanings every 6–12 months prevent it — and early care gives you the best chance of keeping your teeth.

What is periodontitis?

Periodontitis (per-e-o-don-TIE-tis) is a serious gum infection that damages the soft tissue around your teeth. The word is also commonly known as gum disease. Without treatment, periodontitis can destroy the bone that supports your teeth. This can cause teeth to loosen or lead to tooth loss.

The condition is common, but it is usually preventable. In most cases, it is the result of not taking care of your mouth and teeth. Healthy gums are firm and fit snugly around teeth, and their color can vary from light pink to dark pink and brown depending on the person.

What does periodontitis look and feel like?

Symptoms do not always cause pain, which is why the condition can progress quietly. The most common early clue is bleeding when brushing or flossing.

Symptom	What you would notice
Swollen or puffy gums	Gums look raised or thickened around the teeth
Red or purple gums	Healthy pink color turns bright red, dark red, or dark purple
Tender gums	Gums feel sore or sensitive when touched
Bleeding gums	Bleeding easily, a pink toothbrush, or blood when spitting after brushing or flossing
Persistent bad breath	Bad breath that will not go away with brushing
Pus	Pus between your teeth and gums
Loose teeth	Teeth or tooth loss
Painful chewing	Discomfort while eating
Black triangles	New spaces that develop between your teeth
Receding gums	Gums pull away from your teeth, making teeth look longer than usual
Bite change	A change in how your teeth fit together when you bite

How plaque turns into periodontitis

In most cases, the development of periodontitis starts with plaque. Plaque is a sticky film mainly made up of bacteria. It forms on your teeth when starches and sugars in food interact with bacteria commonly found in your mouth. Brushing twice a day and flossing once a day removes plaque, but plaque quickly comes back.

When plaque is left on teeth, it hardens under the gumline into tartar. Tartar is much more difficult to remove. You cannot get rid of it by brushing and flossing; it requires a professional dental cleaning. Because plaque and tartar are filled with bacteria, the longer they stay on your teeth, the more damage they can do.

Plaque can then cause gingivitis, the mildest form of gum disease. Gingivitis is irritation and swelling of the gum tissue around the base of your teeth (the gingiva is another word for gum tissue). Gingivitis can be reversed with professional treatment and good home oral care, but only if it is treated early, before bone loss occurs.

If gum irritation and swelling continue, the ongoing inflammation can cause periodontitis. Deep pockets form between your gums and teeth. These pockets fill with plaque, tartar, and bacteria and become deeper over time. Without treatment, these deep infections cause a loss of tissue and bone, and eventually you may lose one or more teeth.

Who is at higher risk?

Factors that can increase your risk of periodontitis include having had gingivitis, poor oral health care habits, and smoking or chewing tobacco. Hormonal changes related to pregnancy or menopause also raise risk, as do recreational drug use such as smoking marijuana or vaping.

Other risk factors include obesity, poor nutrition with a low vitamin C level, and genetics. Certain medicines that cause dry mouth or gum changes add risk. So do conditions that lower immunity, such as leukemia, HIV/AIDS, and cancer treatment. Finally, certain diseases — including diabetes, rheumatoid arthritis, and Crohn's disease — increase your odds of developing periodontitis.

Risk factor	Why it matters
Gingivitis	The early, untreated stage that advances into periodontitis
Poor oral care habits	Allows plaque to build up and harden into tartar
Smoking or chewing tobacco	Strongly linked to gum disease development
Vaping or marijuana use	Recreational drug use is a listed risk factor
Hormonal changes	Pregnancy and menopause shift the gum environment
Obesity	Listed as an independent risk factor
Low vitamin C / poor nutrition	Nutrition supports gum tissue health
Genetics	Some people inherit a higher susceptibility
Dry-mouth medicines	Less saliva means more plaque and bacteria
Lowered immunity	Leukemia, HIV/AIDS, cancer treatment reduce defenses
Other diseases	Diabetes, rheumatoid arthritis, and Crohn's disease raise risk

Why it matters beyond your mouth

Periodontitis can cause tooth loss, but the consequences can extend further. The bacteria that cause periodontitis can enter your bloodstream through gum tissue, possibly affecting other parts of your body. Periodontitis is linked with respiratory disease, rheumatoid arthritis, and coronary artery disease. It is also linked with preterm birth and low birth weight, and with problems controlling blood sugar in people with diabetes.

How dentists diagnose periodontitis

To tell whether you have periodontitis and how severe it is, your dentist will typically follow a set of steps. First, they review your medical history to identify factors linked to your symptoms, such as smoking or medicines that cause dry mouth. Next, they examine your mouth to look for plaque and tartar buildup and check for easy bleeding.

The key measurement is pocket depth. Your dentist places a tiny ruler called a dental probe between your teeth and gumline. Pockets are measured at several places in your upper and lower gums. In a healthy mouth, the pocket depth is usually between 1 and 3 millimeters (mm). Pockets deeper than 4 mm may indicate periodontitis. Pockets deeper than 5 mm cannot be cleaned well with routine care.

Your dentist may also take dental X-rays to check for bone loss in areas where deeper pockets were found. Based on how severe the disease is, the complexity of treatment, your risk factors, and your overall health, your dentist may assign a stage and a grade to the periodontitis. Then a treatment plan is made.

Treatment: what happens first

Treatment may be done by a dentist or a periodontist. A periodontist is a dentist who specializes in gum disease. A dental hygienist may work with your dentist or periodontist as part of your treatment plan. The goal of treatment is to thoroughly clean the pockets around teeth and prevent damage to surrounding gum tissue and bone.

You have the best chance for successful treatment when you also maintain a daily routine of good oral care, manage health conditions that may affect dental health, and stop tobacco use.

If periodontitis is not advanced, treatment may involve less invasive, nonsurgical procedures. Scaling removes tartar and bacteria from your tooth surfaces and below your gumline; it may be done using instruments, a laser, or an ultrasonic device. Root planing smooths the root surfaces, which helps prevent further buildup of tartar and bacteria and helps your gums attach to your teeth again. Antibiotics — topical or oral — can help control bacterial infection. Topical options include antibiotic mouth rinses or a gel containing an antibiotic placed into gum pockets, while oral antibiotics are sometimes needed to clear the bacteria causing infections.

Nonsurgical treatment	What it does
Scaling	Removes tartar and bacteria from tooth surfaces and below the gumline, using instruments, a laser, or an ultrasonic device
Root planing	Smooths the root surfaces to prevent new buildup and help gums reattach to teeth
Antibiotics	Controls bacterial infection via mouth rinse, pocket gel, or oral pills

When surgery becomes necessary

If you have advanced periodontitis, you may need dental surgery. Several procedures exist, and which one applies depends on how much tissue and bone the disease has damaged.

Flap surgery, also called pocket reduction surgery, involves your periodontist making cuts in your gums to carefully fold back the tissue. This exposes the tooth roots for more effective scaling and root planing. Because periodontitis often causes bone loss, the underlying bone may be reshaped before the gum tissue is stitched back in place. After you heal, it is easier to clean the areas around your teeth and maintain healthy gum tissue.

Soft tissue grafts are used when you lose gum tissue and your gumline lowers, exposing some of your tooth roots. Some of the damaged tissue is reinforced, usually by removing a small amount of tissue from the roof of your mouth or using tissue from a donor source and attaching it to the affected site. This helps reduce further gum loss, covers exposed roots, and improves appearance.

Bone grafting is performed when periodontitis destroys the bone around your tooth root. The graft may come from small bits of your own bone, or the material may be artificial or donated. The bone graft helps prevent tooth loss by holding your tooth in place, and it also serves as a platform for the regrowth of natural bone.

Guided tissue regeneration allows the regrowth of bone destroyed by bacteria. In one approach, your dentist places a special type of fabric between existing bone and your tooth. The material prevents unwanted tissue from growing into the healing area, allowing bone to grow back instead.

Tissue-stimulating proteins involve another approach: a special gel applied to a diseased tooth root. The gel contains the same proteins found in developing tooth enamel and stimulates the growth of healthy bone and tissue.

Surgical treatment	When it is used	What it accomplishes
Flap (pocket reduction) surgery	Advanced periodontitis needing deep cleaning	Folds back gums for effective scaling; bone may be reshaped
Soft tissue graft	Lost gum tissue and exposed roots	Reinforces the gumline, covers roots, improves appearance
Bone grafting	Bone destroyed around the tooth root	Holds the tooth in place and supports natural bone regrowth
Guided tissue regeneration	Bone destroyed by bacteria	Fabric barrier allows bone to grow back
Tissue-stimulating proteins	Diseased tooth root needing regeneration	Enamel-protein gel stimulates healthy bone and tissue growth

Daily care and home habits that support treatment

Try these measures to reduce or prevent periodontitis. Brush your teeth twice a day, or better yet, after every meal or snack. Use a soft toothbrush and replace it at least every three months. Consider an electric toothbrush, which may be more effective at removing plaque and tartar.

Floss every day. If standard dental floss is hard to use, try a floss holder. Other options include interdental brushes, water flossers, or interdental cleaning aids designed to clean between your teeth. Talk with your dentist or dental hygienist about what would work best for you. Use a mouth rinse to help reduce plaque between your teeth if your dentist recommends it. Get regular professional dental cleanings on the schedule your dentist recommends, and do not smoke or chew tobacco.

The best prevention habit is good oral care started young and kept throughout life: brushing for two minutes at least twice a day — in the morning and before bed — and flossing at least once a day. Flossing before you brush allows you to clean away loosened food bits and bacteria. Regular dental visits for cleanings usually run every 6 to 12 months; if you have risk factors such as dry mouth, certain medicines, or smoking, you may need professional cleaning more often.

Preparing for your dental visit

You may start by seeing your general dentist. Depending on how severe your periodontitis is, your dentist may refer you to a periodontist. Before your appointment, make a list of any symptoms you are experiencing, including any that may not seem related. Include key personal information such as medical conditions, all medicines you take (including over-the-counter medicines, vitamins, herbs, and supplements, with doses), and questions to ask your dentist.

Questions to ask your dentist	Questions your dentist may ask you
What's likely causing my symptoms?	When did you first start having symptoms?
What kinds of tests, if any, do I need?	Do symptoms come and go, or are they constant?
What's the best plan of action?	How often do you brush your teeth?
Will my dental insurance cover the treatments?	Do you use dental floss, and how often?
What are other options to the approach suggested?	How often do you see a dentist?
Are there any restrictions I need to follow?	What medical conditions do you have?
What steps can I take at home?	What medicines do you take?
Are there brochures or printed material I can have?	Do you use tobacco products?
What websites do you recommend?	—

When to see a dentist

Follow your dentist's recommended schedule for regular checkups. If you notice any symptoms of periodontitis, make an appointment with your dentist as soon as possible. The sooner you get care, the better your chances of reversing damage from periodontitis.

Conclusion: protect your gums before they pull back

Periodontitis is a silent threat — it starts with plaque you cannot always see, advances through bleeding gums you may dismiss, and only announces itself loudly when bone and teeth are already at risk. The disease path is well understood, the diagnosis is quick and painless, and both nonsurgical and surgical treatments exist to stop it in its tracks. But the most powerful tools are the daily ones: two minutes of brushing twice a day, daily flossing, and dental cleanings every 6 to 12 months.

Your next step: If your gums bleed when you brush or floss, do not wait. Book a dental appointment this week and ask for a full periodontal evaluation, including pocket depth measurements. If you smoke or vape, talk with your dentist about support for quitting — stopping tobacco is one of the biggest single improvements you can make for your gum health.

Explore more on Rinnit: Continue your oral health education with our guides on gingivitis — why gums bleed and how daily care reverses it and dry mouth and why it raises your dental risk.

Frequently asked questions

Can periodontitis be reversed?

Early-stage gum disease (gingivitis) can be reversed with professional treatment and good home care before bone loss occurs. Once periodontitis has caused bone loss, the lost bone does not grow back on its own, but treatment can stop the disease from progressing and help you keep your teeth.

How is periodontitis measured?

Your dentist uses a tiny ruler called a dental probe to measure the pocket depth between your gums and teeth. Healthy pockets measure 1–3 mm. Pockets deeper than 4 mm may indicate periodontitis, and pockets deeper than 5 mm cannot be cleaned well with routine home care.

What is the difference between gingivitis and periodontitis?

Gingivitis is the mildest form of gum disease — irritation and swelling of the gum tissue that is reversible if treated early. Periodontitis is the advanced stage, in which deep infected pockets form and destroy the tissue and bone supporting your teeth.

Does periodontitis affect the rest of the body?

The bacteria that cause periodontitis can enter your bloodstream through gum tissue. Periodontitis has been linked with respiratory disease, rheumatoid arthritis, coronary artery disease, preterm birth and low birth weight, and difficulty controlling blood sugar in diabetes.

What is scaling and root planing?

Scaling removes tartar and bacteria from your tooth surfaces and below the gumline using instruments, a laser, or an ultrasonic device. Root planing then smooths the root surfaces to prevent new buildup and help your gums reattach to your teeth.

Is periodontitis treatment painful?

Scaling and root planing are done under local anesthetic and are generally well tolerated. Surgical options such as flap surgery or grafts also use anesthesia, and your periodontist will walk you through what to expect and how to manage discomfort during healing.

Can periodontitis come back after treatment?

The condition can recur if plaque and tartar are allowed to build up again. Lasting results depend on a daily routine of brushing and flossing, quitting tobacco, managing health conditions like diabetes, and keeping regular professional cleaning appointments.

Sources

1. Periodontitis — Symptoms & causes — Mayo Clinic

2. Periodontitis — Diagnosis & treatment — Mayo Clinic

Health information, not medical advice. This article is for general education and is not a substitute for professional diagnosis or treatment. Always consult a qualified healthcare provider about your own health, and seek emergency care for urgent symptoms.