Gum Disease Stages and Symptoms: From Gingivitis to Advanced Periodontitis

Q: What are the first signs of gum disease?

Gums that bleed when you brush or floss, and gums that look red or swollen, are the most common early signs. Early gum disease is often painless, so an examination is the reliable way to know.

Q: Can stage III or IV periodontitis be treated?

Yes. Advanced stages usually need more involved treatment, such as laser-assisted therapy, surgery, regeneration, or tooth replacement, but the disease can still be controlled and remaining teeth protected.

Q: Can gum disease go back to an earlier stage?

Gingivitis can be reversed. In periodontitis, lost attachment and bone do not return on their own, so the stage reflects past damage; treatment aims to stop further loss and, in selected cases, regenerate some support.

Q: How does a periodontist determine my stage?

By measuring the pockets and attachment around each tooth, checking bleeding, recession, and mobility, reviewing X-rays, and noting tooth loss and other complexity factors.

Q: Does smoking make gum disease worse?

Yes. Smoking is a major risk factor; the CDC reports that about 62% of U.S. adults aged 30 or older who smoked had periodontitis in 2009–2014, and heavy smoking raises the disease grade.

Part of the Periodontal Disease guide

Gum disease develops gradually, from bleeding gums that can be reversed to bone loss that cannot. Knowing the signs, and understanding the staging system periodontists use, makes it easier to act at the right time and to follow what your specialist tells you.

The warning signs

The CDC lists these symptoms of gum disease:

Red or swollen gums
Bleeding gums
Gum recession, where teeth look longer
Loose teeth
Sensitive teeth
Pain when chewing
A change in how the teeth fit together when you bite

The difficulty is that early gum disease is often painless, and some people have significant bone loss with few symptoms at all. Bleeding is the most common early sign but is easy to dismiss. That is why a measurement-based examination, not symptoms alone, is used to diagnose periodontitis.

Gingivitis: the reversible stage

Gingivitis is inflammation of the gums caused by plaque along the gumline. The gums may be red, puffy, and bleed when you brush or floss, but the attachment between gum and tooth and the bone beneath are intact. The National Institute of Dental and Craniofacial Research notes that gingivitis can usually be reversed with daily brushing and flossing and regular professional cleanings.

Why it matters

Not everyone with gingivitis develops periodontitis, but periodontitis is always preceded by gingivitis. Treating bleeding gums early is the simplest way to prevent bone loss.

Periodontitis: when bone and attachment are lost

In periodontitis, inflammation has destroyed part of the fibers and bone that hold the tooth. The gum separates from the tooth to form a pocket, which collects more bacteria and deepens over time. This loss does not reverse on its own. Treatment aims to stop it, shrink the pockets, and keep the teeth stable.

It is common. According to the CDC, about 4 in 10 U.S. adults aged 30 or older had some level of periodontitis in 2009–2014, rising to about 60% of adults aged 65 or older. About 1 in 2 men and 1 in 3 women aged 30 or older were affected.

The four stages of periodontitis

Since the 2017 World Workshop on the classification of periodontal diseases, periodontists describe periodontitis by stage, which reflects how much damage has occurred and how complex treatment will be. The summary below is drawn from the American Academy of Periodontology's staging chart.

Stage	Attachment loss (worst site)	Bone loss on X-ray	Other features
I — Initial	1–2 mm	Coronal third (<15%)	Probing depth up to 4 mm; mostly horizontal bone loss
II — Moderate	3–4 mm	Coronal third (15–33%)	Probing depth up to 5 mm; mostly horizontal bone loss
III — Severe	5 mm or more	Middle third of the root and beyond	Up to 4 teeth lost to periodontitis; deeper pockets (6 mm+), vertical defects, or furcation involvement
IV — Advanced	5 mm or more	Middle third of the root and beyond	5 or more teeth lost; need for complex rehabilitation, such as bite collapse or fewer than 20 remaining teeth

Source: AAP, from Tonetti et al., J Periodontol 2018. Stage is assigned by a clinician from measurements and imaging.

Each stage is also described by extent: localized when fewer than 30% of teeth are involved, generalized when more are, or a molar/incisor pattern.

Grades: how fast it is progressing

The grade estimates the rate of progression and how the disease may respond to treatment. Grade A is slow, grade B moderate, and grade C rapid. Clinicians start by assuming grade B and look for evidence to move it up or down, such as bone loss measured over time or bone loss that is out of proportion to age.

Two risk factors can raise the grade on their own: smoking 10 or more cigarettes a day, and diabetes with an HbA1c of 7.0% or higher. That is one reason your periodontist asks about both, and why quitting smoking and controlling blood sugar are part of treatment.

What your stage means for treatment

Stage I and II disease often responds well to scaling and root planing and improved home care. Stage III may need additional therapy, such as laser-assisted treatment or surgery, for pockets that persist. Stage IV usually involves a broader plan that may include tooth replacement and bite rehabilitation. These are general patterns; your plan is based on your own findings.

See how to treat gum disease, the LANAP guide, and what happens at a first periodontal appointment, where staging is determined.

“Your first visit is a conversation, not a procedure. We send your plan in writing after, so you can think it over at home.”

— Dr. Mohamed Khaled, DDS, MSD, Diplomate of the American Board of Periodontology. From Sterling’s practice introduction.

When to see a periodontist

Ask for a periodontal evaluation if your gums bleed regularly, if your dentist has measured deepening pockets, if teeth feel loose or have shifted, or if recession is progressing. The AAP's comprehensive periodontal evaluation describes what a full assessment includes.

Sterling Periodontics & Implantology is at 9301 Wilshire Boulevard, Suite 407, Beverly Hills. Call (310) 278-3666 or request a consultation.

Frequently Asked Questions

What are the first signs of gum disease?