Gum recession happens when the gum tissue surrounding your teeth wears away or pulls back, exposing more of the tooth or even the tooth root. There’s rarely a single cause. Most cases involve a combination of factors, from how you brush your teeth to the genetics you inherited. Understanding what’s behind the process can help you slow it down or prevent it from getting worse.
Gum Disease
Periodontal disease is the most common driver of gum recession. It starts when bacterial plaque, the sticky film that forms on teeth throughout the day, isn’t removed effectively. Over time, plaque hardens into tartar, which sits along and below the gumline and can’t be removed with regular brushing. The bacteria in plaque and tartar trigger a chronic inflammatory response in the gum tissue, which gradually destroys the attachment between your gums and teeth.
As the infection deepens, it doesn’t just affect soft tissue. Bone loss is common in areas of gum recession, meaning the underlying bone that supports the tooth also breaks down. Once that bone is gone, the gum tissue that once sat on top of it has nothing to cling to, and it recedes further. This is why gum disease can progress silently for years before you notice visible changes. By the time gums look noticeably lower, there may already be significant bone loss underneath.
Aggressive or Improper Brushing
Brushing too hard is one of the most overlooked causes of recession, especially among people who think they’re taking good care of their teeth. A back-and-forth scrubbing motion with a firm-bristled brush wears away the thin gum tissue along the outer surface of teeth over months and years. The damage is physical, not bacterial, which is why it can happen even in mouths with no signs of gum disease.
Bristle quality matters more than most people realize. Studies examining toothbrushes under high-powered microscopes have found that the acceptability of bristle tip rounding varies dramatically between brands, from as low as 22% to as high as 88%. Poorly rounded bristles are more likely to scratch and irritate gum tissue. The amount of pressure you apply and the quantity of toothpaste you use also accelerate bristle wear, which in turn increases the abrasive potential on the softer root surfaces of teeth. Switching to a soft-bristled brush and using gentle, circular strokes rather than horizontal scrubbing can make a significant difference.
Thin Gum Tissue
Not everyone starts with the same gum tissue. Gingival biotype, essentially how thick or thin your gums are, is a genetically determined trait. People with thick gum tissue tend to have a broader band of firm, attached gum around each tooth. This tissue is more resilient. It handles inflammation better, recovers more easily from minor trauma, and is less prone to recession overall.
Thin gum tissue tells a different story. It appears almost translucent, with a narrow band of attached gum and minimal underlying bone. This tissue is more fragile and less resistant to both inflammation and physical irritation. Research on patients without periodontal disease found that nearly 74% of sites showing recession had a thin biotype. In other words, some people are simply more structurally vulnerable to recession regardless of how well they care for their teeth. If you have thin gums, even mild irritation from brushing or slight plaque buildup can trigger tissue loss that someone with thicker gums might never experience.
Teeth Grinding and Clenching
Grinding or clenching your teeth, a habit known as bruxism, places enormous force on your teeth and the tissues supporting them. Most people grind at night and don’t realize they’re doing it until a dentist notices the wear patterns. Over time, this constant pressure weakens the gum tissue at the base of the affected teeth. The gums become inflamed from the repeated stress and gradually pull away from the tooth surface.
The effect is slow but cumulative. You’re unlikely to notice recession from grinding over weeks or even months, but over years it can become significant, particularly on teeth that bear the most force. This is one reason dentists recommend night guards for people who grind: protecting the gums and bone is just as important as protecting the tooth enamel itself.
Tobacco Use
Smoking and other forms of tobacco use accelerate gum recession through multiple pathways. Tobacco weakens your immune system, making it harder to fight off the bacterial infections that cause gum disease. At the same time, it impairs blood flow to the gums, which slows healing. So not only are smokers more likely to develop gum disease in the first place, but when damage occurs, their gum tissue is less capable of repairing itself. This creates a cycle where tissue loss progresses faster and responds less well to treatment.
Hormonal Changes
Fluctuations in estrogen and progesterone increase blood flow to the gums, making them more sensitive and more reactive to even small amounts of plaque. This heightened sensitivity shows up at several points in life. During puberty, surging hormones can cause gums to become red, swollen, and prone to bleeding. Some women notice similar symptoms around their menstrual cycle each month.
Pregnancy brings an even more pronounced version of this effect. Pregnancy gingivitis, a mild form of gum disease causing tender, sore gums, is most common between the second and eighth months. While it usually resolves after delivery, repeated bouts of inflammation can weaken the gum attachment over time.
Menopause introduces a different risk. The drop in estrogen that accompanies menopause can lead to a loss of bone density throughout the body, including the jawbone. When jaw bone thins, gums recede to match, exposing more of the tooth surface. This is why some women notice their teeth looking longer after menopause even without any change in their oral hygiene routine.
Other Contributing Factors
Crooked or misaligned teeth can create uneven forces during biting and chewing, concentrating pressure on certain teeth and the gum tissue around them. Teeth that sit outside their normal position in the arch may also have thinner bone and gum coverage on one side, making them more vulnerable to recession.
Oral piercings, particularly lip and tongue studs, can rub repeatedly against the gums on the inside of the lower front teeth. This chronic friction wears away tissue in the same way aggressive brushing does, and the damage tends to be localized to the spot where the jewelry makes contact.
Poorly fitting dental restorations, like crowns or partial dentures that press against the gum margin, can also irritate tissue enough to cause it to pull away over time. Even orthodontic treatment, if teeth are moved too aggressively through thin bone, can contribute to recession in some cases.
Why Multiple Causes Matter
Gum recession rarely comes down to a single factor acting alone. Someone with genetically thin gums who also brushes aggressively faces a much higher risk than someone with thick tissue and the same brushing habit. A person who grinds their teeth at night and smokes is stacking two independent sources of damage. Identifying which factors apply to you is what makes prevention and treatment effective, because addressing only one cause while ignoring others means the recession is likely to continue.