How Plaque Between Teeth Can Damage Gums
A toothbrush cleans the broad, exposed sides of teeth, but its bristles may not reach the narrow spaces where neighboring teeth touch. Dental plaque—a sticky film of bacteria and food debris—can build up there. If it remains, bacteria irritate the gum tissue along the tooth’s edge, causing gingivitis: gums that may look red, feel tender, or bleed during brushing.
From Irritation to Lasting Damage
Gingivitis is often reversible with consistent cleaning. But when plaque is left undisturbed, it can harden into tartar, which is harder to remove at home. In some people, ongoing inflammation can extend below the gumline and damage the tissue and bone that hold teeth in place. That more serious condition, periodontitis, can loosen teeth over time.
Floss works by sliding into the tight contact between teeth and wiping plaque from the sides, including just beneath the gum edge. The aim is not to saw at the gums; gentle, controlled strokes clean the tooth surface without injuring the tissue. Interdental brushes or other between-teeth cleaners can serve the same purpose when they fit the spaces well.
The Routine Matters
Cleaning between teeth is most useful when it is regular, because plaque accumulates again after it is removed. Bleeding can be a sign of inflamed gums, not a reason to avoid the area; persistent bleeding or discomfort is worth discussing with a dental professional. A toothbrush cleans what it can reach; gum protection also depends on cleaning the surfaces it cannot.
