Quick answer: Gums that bleed when you brush are most often an early sign of gum inflammation called gingivitis, caused by plaque building up where your teeth meet your gums. At this stage it is usually reversible with gentle, thorough brushing, daily flossing and a professional cleaning. If the bleeding does not settle after a week or two of good daily care, or you notice swelling, receding gums, bad breath that will not go away or loose teeth, book a dental exam. Gum disease is often painless, so bleeding may be the only early warning you get.
Gum disease is very common. According to the Canadian Dental Association, seven out of ten Canadians will develop gum disease at some point in their lives, and it can progress without pain until it becomes a real problem. The good news is that the early stage can be turned around.
Why Do My Gums Bleed When I Brush?
The most common cause is plaque, the soft, sticky film of bacteria that forms on teeth every day. When plaque is not cleaned away at the gumline, it hardens into tartar (calculus), and the gums become inflamed. Inflamed gums are puffy and fragile, so they bleed when a toothbrush or floss touches them.
Other things can make gums bleed more easily or make gum disease more likely:
- Brushing too hard or using a hard-bristled brush, which irritates the gums.
- Starting to floss after a long break. Some bleeding in the first days is common and usually settles as the gums get healthier.
- Pregnancy and other hormone changes, which can make gums more sensitive to plaque.
- Smoking, the biggest risk factor you can change. Smoking can also hide bleeding, so gums that do not bleed are not always healthy gums.
- Diabetes, especially when blood sugar is not well controlled.
- Some medications, including blood thinners. Do not stop a prescribed medication; tell your dentist and doctor about the bleeding instead.
- Crowded teeth or old dental work that is hard to clean around.
The Stages of Gum Disease
Gum disease usually develops slowly. Knowing the stages helps you understand why early care matters.
| Stage | What is happening | What you may notice | Can it be reversed? |
|---|---|---|---|
| 1. Gingivitis | Plaque and tartar inflame the gums. The bone and tissue holding the teeth are not yet damaged. | Red or puffy gums that bleed a little when you brush or floss. Often no pain. | Yes, with professional cleaning and good daily care. |
| 2. Early periodontitis | Infection spreads below the gumline and small pockets form between the gums and teeth. | Bleeding, bad breath, gums starting to pull back from the teeth. | The damage cannot be undone, but treatment can stop it getting worse. |
| 3. Moderate periodontitis | Pockets deepen and the bone supporting the teeth begins to break down. | Receding gums, sensitivity, a bad taste, teeth that feel slightly loose. | Treatment aims to control the infection and protect what remains. |
| 4. Advanced periodontitis | Significant bone and tissue loss around the teeth. | Loose or shifting teeth, changes in your bite, pus around the gums, teeth that may need to be removed. | Often needs specialist care; some teeth may be lost. |
Because the early stages are usually painless, many people only find out they have gum disease at a dental exam. Regular checkups and cleanings are how it gets caught early.
What You Can Do at Home Starting Today
- Keep brushing, gently. Do not avoid the areas that bleed. Use a soft-bristled brush and fluoride toothpaste twice a day, angling the bristles toward the gumline.
- Floss once a day. Curve the floss into a C shape around each tooth and slide it gently under the gumline. Interdental brushes or a water flosser can help if floss is hard to use.
- Give it a week or two. With gentle, consistent cleaning, bleeding from mild gingivitis often starts to settle. If it does not, that is your sign to book an exam.
- If you smoke, consider quitting. It is the single biggest change you can make for your gums.
- Do not rely on mouthwash alone. It cannot remove tartar; only a professional cleaning can.
When to See a Dentist
Book a dental exam if you notice any of the following:
- Bleeding that continues after a week or two of gentle daily brushing and flossing
- Red, swollen or tender gums
- Gums that look like they are pulling away from your teeth
- Bad breath or a bad taste that will not go away
- Teeth that feel loose, have shifted, or a bite or denture fit that has changed
- You are pregnant, have diabetes or smoke, and have not had your gums checked recently
Get help the same day if you have pus or a painful swelling on the gum (a possible abscess), facial swelling, or a fever with mouth pain. See our emergency dental care page. If you have heavy bleeding that will not stop, trouble breathing or swallowing, or swelling spreading toward your eye or neck, go to the nearest emergency department or call 911.
How Dentists Treat Bleeding Gums and Gum Disease
At your visit, your dentist will check your gums, gently measure the space between the gums and each tooth, and may take x-rays to look at the bone. Treatment depends on the stage:
- Gingivitis: a professional teeth cleaning to remove plaque and tartar, plus tips to make your home care more effective.
- Periodontitis: deeper cleaning below the gumline (often called scaling and root planing), sometimes over more than one visit, followed by more frequent check-ups to keep the gums stable.
- Advanced cases: your dentist may refer you to a periodontist, a dental specialist with at least three years of extra university training in treating gum disease.
Learn more about our preventive dentistry and general dentistry services. If gum disease has already cost you a tooth, our guide to implants, bridges and dentures explains the options.
Does CDCP Cover Gum Disease Treatment?
Yes. Under the Canadian Dental Care Plan, periodontal (gum) services include cleaning under the gumline, treating abscesses and non-surgical gum disease management, along with exams, x-rays and regular cleanings. Some services, such as bonding loose teeth together, need preauthorization first.
Depending on your family income, you may owe a co-payment of 0%, 40% or 60% of the CDCP established fee, plus the difference if our fee for a service is higher than the CDCP established fee. We confirm any amount you owe before treatment. See what CDCP covers or our CDCP dentist page.
Frequently Asked Questions
Is it normal for gums to bleed when I start flossing?
A little bleeding in the first few days of flossing is common when gums are inflamed. It usually improves as you keep flossing gently every day. If it has not improved after a week or two, book a dental exam.
Will bleeding gums go away on their own?
Not usually. Bleeding from plaque build-up needs the plaque removed. Better brushing and flossing can help mild gingivitis, but hardened tartar can only be removed with a professional cleaning.
Should I stop brushing where my gums bleed?
No. Avoiding those areas lets more plaque build up and makes the bleeding worse. Keep brushing gently with a soft-bristled brush.
Why do my gums bleed more during pregnancy?
Hormone changes during pregnancy can make the gums react more strongly to plaque. Keep up your brushing and flossing, and let your dentist know you are pregnant so they can check your gums.
Is gum disease reversible?
The earliest stage, gingivitis, is reversible with professional cleaning and good daily care. Once periodontitis has damaged the bone around the teeth, that loss cannot be undone, but treatment can stop it from getting worse.
Book a Gum Check in Guelph
If your gums bleed when you brush, a quick exam can tell you what is going on and what to do about it. Dentistry on Guelph is at 380 Eramosa Rd, Unit 6, Guelph, with free parking. We are open Monday to Friday 9 AM to 7 PM and Saturday 9 AM to 4 PM, and we welcome new patients. Call (226) 541-5050 or book online. New to our clinic? See what to expect at your first visit.
Sources
- Canadian Dental Association, Gum Disease FAQs
- Government of Canada, What services are covered in the Canadian Dental Care Plan
- StatPearls, Periodontal Disease (National Library of Medicine, NCBI Bookshelf)
Sources checked November 5, 2026. This article is general information and does not replace an examination by a dentist.
