Most people have noticed their gums bleed at some point. The usual advice - brush more gently, floss more regularly - isn't wrong, but it misses something important.
Bleeding gums are almost always a sign of inflammation, not a sign that you're brushing too hard. Understanding what's driving that inflammation changes how you think about treating it.
The mechanics of gum inflammation
Your gums are in constant contact with bacteria. A healthy oral microbiome keeps this in balance - the beneficial bacteria in your mouth help manage the environment around your gum line, maintaining the conditions that prevent harmful species from gaining ground.
When that balance is disrupted, certain bacteria proliferate in the pockets between your teeth and gums. Their metabolic by-products trigger an inflammatory immune response. That response is what causes your gums to swell, redden, and bleed - what dentists call gingivitis.
Gingivitis is extremely common. Left untreated, it can progress to periodontitis - a deeper infection of the structures supporting your teeth, and the leading cause of adult tooth loss in the UK.
What can make it worse
Two ingredients found in conventional oral care products are worth knowing about if you have persistent gum sensitivity.
Sodium Lauryl Sulfate (SLS) - the foaming agent in most standard toothpastes - is associated with irritation of the oral mucosa. Published clinical studies have found a correlation between SLS-containing toothpastes and increased frequency of aphthous ulcers (canker sores) and gum sensitivity in susceptible individuals. For most people this is not an issue; for those with recurring ulcers or sensitivity, an SLS-free alternative is increasingly recommended by dental professionals.
Alcohol-based mouthwashes are effective at reducing bacteria in the short term. The drawback is longer-term: alcohol dries out the oral mucosa and disrupts the moisture balance that supports healthy tissue. The bacterial rebound after an alcohol rinse also tends to favour the anaerobic species associated with inflammation. Neither ingredient is harmful for most people in normal use - but if your gums are regularly irritated, they're worth reconsidering.
What the evidence supports
Regular plaque removal - through brushing and interdental cleaning - remains the single most effective intervention for gum health. No product is a substitute for mechanical cleaning.
Beyond that, the emerging science on the oral microbiome points toward balance rather than aggressive bacterial reduction. Xylitol, for example, selectively inhibits Streptococcus mutans - the primary cavity-causing bacterium - without the broad antimicrobial disruption associated with alcohol. Cetylpyridinium chloride (CPC) in alcohol-free mouthwashes offers targeted antimicrobial action with a more favourable microbiome impact than ethanol-based rinses.
What to look for
If you have persistent gum sensitivity or notice regular bleeding:
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Consider switching to an SLS-free toothpaste to reduce potential mucosa irritation
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Try an alcohol-free mouthwash that targets pathogenic bacteria without disrupting overall microbiome balance
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See your dentist - especially if bleeding is new, persistent, or accompanied by a receding gum line. This post is informational and does not substitute for professional dental advice.
Healthy gums don't bleed. Treating them well doesn't require aggressive chemistry - it requires the right balance.
→ Explore Laro's Active Mouth Rinse: alcohol-free, CPC-containing, formulated to support a healthy oral microbiome.