What are the early signs of gum disease?

The five early warnings

Gum disease, like most chronic conditions, gives you warnings long before it does real damage. The five signs below appear in roughly this order. Any one of them is reason to book a check-up.

1. Bleeding when you brush or floss

Bleeding on probing (BoP) is recognised in clinical guidelines as one of the most reliable early indicators of gingival inflammation.¹ Healthy gums should not bleed during routine brushing or flossing. A small amount of pink in the basin when you spit, or bleeding at one or two specific teeth, indicates the inflammatory response that precedes gum disease. The blood is the consequence of dilated, leaky capillaries in inflamed tissue. Occasional bleeding from a single mechanical trauma (a popcorn husk, a sharp flossing motion) is different — what matters is bleeding that is reproducible and persistent.

Patients sometimes interpret bleeding as a sign they are brushing too hard. They are not. Brushing harder will not stop the bleeding (and will damage healthy tissue elsewhere). Cleaning more thoroughly, especially between the teeth with floss or interdental brushes, often does — which itself is a useful diagnostic. Bleeding that resolves within two weeks of better hygiene was gingivitis. Bleeding that persists despite better hygiene is more serious and warrants a specialist visit.

One important caveat: smoking can mask this sign. Tobacco constricts the small blood vessels in the gums, so smokers often bleed less even when disease is active — yet smoking is one of the strongest risk factors for periodontitis, with current smokers roughly four times more likely than non-smokers to have it (Tomar & Asma, 2000).³ In a smoker, the absence of bleeding is not reassurance, and other signs (recession, bad breath, loosening) carry more weight.

2. Swollen, puffy gums

Healthy gum tissue is firm and follows the contour of each tooth closely. Inflamed gum tissue looks puffy — the margins are rounded rather than knife-edge, and the tissue feels soft to the touch. The gum may have lifted slightly off the tooth surface, creating a small pocket where plaque accumulates further.

A clear way to check: look at the small triangle of gum between each pair of adjacent front teeth (the "papilla"). In healthy tissue, it comes to a fine point. In gingivitis, it looks blunted or rolled.

3. A colour change at the gum margin

Healthy gums are coral pink — sometimes slightly more pigmented in patients with naturally darker complexions, but evenly so. Inflamed gums shift to a darker, dusky red, sometimes purplish, especially at the margin where the gum meets the tooth. The change can be subtle and is more noticeable in comparison photographs over time than in a single look.

4. Persistent bad breath

The anaerobic bacteria that drive periodontitis produce volatile sulphur compounds — the chemicals responsible for the characteristic "morning breath" everyone experiences, but in greater quantity and continuously. Bad breath that does not improve after brushing, scraping the tongue, and rinsing — and certainly bad breath that has been noted by a partner or colleague — is a sign that the bacteria producing it have an established population to draw from.

Bad breath caused by gingivitis usually clears within days of a professional cleaning. Bad breath caused by deeper periodontal pockets often does not, until the source is treated.

5. Receding gums

This is the bridging sign between gingivitis and early periodontitis. The gum line begins to migrate down the root surface — the tooth looks longer than it used to, and the patient notices increased sensitivity to cold drinks because the exposed root surface is less protected than enamel.

A small amount of recession can be normal with age, particularly on canine teeth where the bone over the root is thin. Recession that is progressive, that affects multiple teeth, or that occurs together with bleeding and pocket formation is a signal that the disease process is no longer reversible.

What healthy gums look and feel like

For comparison:

• Colour: coral pink, even, sometimes with normal melanin pigmentation in darker-skinned patients.
• Texture: firm, with a slightly stippled surface (similar to an orange peel).
• Margin: knife-edge thin, closely adapted to the tooth.
• Papillae: pointed, completely filling the space between adjacent teeth.
• On probing: no bleeding; depths of 1–3 mm.
• No bad breath that persists after normal oral care.

If your gums depart from this picture in any way, that is the threshold for a professional opinion.

What you can do if you notice these signs

If any of these signs are present, three sensible steps:

1. Use an effective brushing routine. A Cochrane systematic review found that powered toothbrushes reduce plaque and gingivitis more than manual brushing over a comparable period.² A soft-headed powered brush is one good option; a careful manual technique with a soft brush, used for two minutes twice daily, is also acceptable.
2. Clean between the teeth daily. Interdental brushes (where the gap allows) or floss reach the surfaces a toothbrush cannot. Most plaque-induced gum inflammation develops in the spaces between the teeth.
3. Book a dental check-up. If your dentist sees signs that look like more than gingivitis, ask for a periodontal probe-charting. If pockets are present that are deeper than 4 mm or there is bleeding at more than a small number of sites, ask for a referral to a periodontist for further assessment.

This article cannot diagnose your specific condition. If you are concerned about your gums, please arrange an examination with a registered dentist or specialist.

When bleeding gums are NOT periodontal disease

Several other things can cause gum bleeding:

• Mechanical trauma — a popcorn husk lodged in the gum, an aggressive flossing motion, an ill-fitting denture.
• Medications — anticoagulants (warfarin, DOACs), some immunosuppressants, and some calcium-channel blockers can cause gum overgrowth or bleeding.
• Hormonal change — pregnancy gingivitis is well-recognised and usually resolves after delivery.
• Vitamin deficiency — vitamin C deficiency can present with bleeding gums (rare in most settings, but reported).
• Blood disorders — bleeding disorders or leukaemias can present with gum bleeding; this is uncommon but is a reason that persistent bleeding should be assessed rather than ignored.

A professional examination is usually sufficient to distinguish these from periodontal disease. The point is not to alarm but to make clear that bleeding is a signal worth investigating.