Gum recession happens when the gum tissue surrounding your teeth pulls back or wears away, exposing more of the tooth root. It’s one of the most common dental problems, and it rarely has a single cause. Most cases involve a combination of factors: gum disease, brushing habits, genetics, smoking, teeth grinding, and even orthodontic treatment can all play a role.
Gum Disease Is the Leading Cause
Periodontal (gum) disease is the most significant driver of recession. It starts when bacterial plaque builds up along and below the gum line, triggering chronic inflammation. Over time, that inflammation doesn’t just irritate the gums. It causes enzymatic breakdown of the connective tissue that anchors your gums to your teeth, and it triggers resorption of the underlying bone. As bone is lost, the gum tissue loses its structural support and migrates downward, exposing the root surface.
Once a root is exposed, the problem tends to compound. The exposed root surface becomes coated with bacterial toxins called lipopolysaccharides, which are so damaging that the body can’t easily rebuild the fiber attachment that once held the gum in place. This is why advanced gum disease is difficult to reverse without professional treatment, and why catching it early matters so much.
Brushing Too Hard Wears Gums Away
Aggressive toothbrushing is one of the most common causes of recession in people who don’t have gum disease. The damage comes from a combination of too much force, the wrong technique, and overly stiff bristles.
Research on brushing force shows a clear dose-response pattern. People who brush with about 2.1 newtons of force tend to show no recession, while those applying around 2.4 newtons develop minor recession, and forces of 3.8 newtons or higher produce severe recession. For context, the average person brushes at roughly 2.3 newtons, and about 17.5% of adults brush at 3 newtons or more. Men tend to brush harder than women.
Technique matters just as much as pressure. The horizontal scrub method, where you move the brush back and forth across your teeth, is the most commonly used technique and the most damaging. That repetitive side-to-side motion concentrates abrasion right at the gum line, gradually wearing down the tissue. A rolling motion distributes the abrasion more evenly across the tooth surface and is far gentler on gums.
Bristle stiffness adds another layer. Hard-bristled brushes increase the pressure applied to your gums and cause more surface loss than softer bristles at the same force. Systematic reviews have concluded that soft and extra-soft bristles are safe, while medium-hard bristles can create small tears in the gum tissue. If you’re prone to recession, switching to a soft-bristled brush and consciously lightening your grip are two of the simplest changes you can make.
Your Gum Thickness Is Partly Genetic
Not everyone starts with the same amount of gum tissue. Dentists categorize gums into two broad types: thick and thin. A thick biotype measures more than 1 millimeter, appears dense and wide, and has a generous band of firm, attached tissue. A thin biotype is 1 millimeter or less, looks translucent and delicate, and has a narrower band of attached gum.
If you have a thin biotype, you’re inherently more vulnerable to recession. Thin gums are less stable, more prone to connective tissue loss and surface damage, and more likely to develop papillary and marginal recession. The bone underneath thin gums also tends to be more scalloped, with natural gaps and weak spots (called fenestrations and dehiscences) where the bone doesn’t fully cover the root. These areas are especially prone to recession when any additional stress is applied, whether from brushing, inflammation, or orthodontic movement. You can’t change your biotype, but knowing you have thin gums means you can be more careful with the factors you do control.
Smoking Multiplies the Risk
Tobacco use is one of the strongest modifiable risk factors for gum recession. The relationship is dose-dependent: a large study of Spanish patients found that smoking up to 10 cigarettes a day increased clinical attachment loss by 5%, while smoking up to 20 per day doubled that to 10%. Across multiple studies, smokers face 2.5 to 7 times the risk of periodontal disease compared to nonsmokers, with heavy smokers at the highest end of that range.
A 12-month longitudinal study found that smokers had 5.4 times the odds of significant attachment loss compared to nonsmokers. The severity of bone loss also scales with consumption: one large study of over 1,300 adults showed odds ratios for severe bone loss ranging from 3.25 in light smokers to 7.28 in heavy smokers. Smoking accelerates the same destructive process that gum disease causes, breaking down the bone and connective tissue that hold your gums in place.
Teeth Grinding and Bite Problems
Bruxism, the habit of grinding or clenching your teeth, puts non-physiological force on your teeth and the tissues surrounding them. This force creates what dentists call occlusal trauma, which is damage to the structures supporting the tooth caused by excessive biting pressure.
Grinding alone isn’t considered a direct cause of gum disease. However, when any degree of gum disease is already present, bruxism accelerates the damage significantly, often pushing mild disease into severe periodontitis in a short period of time. Think of it as an amplifier: grinding won’t start the fire, but it fans existing flames. If you grind your teeth at night and also have early signs of gum inflammation, addressing both problems simultaneously is important.
Orthodontic Treatment
Braces and aligners move teeth by remodeling the bone around them. When a tooth is pushed outward (toward the lip or cheek), it can move beyond the envelope of supporting bone. If the bone on the outer side becomes too thin, or develops a gap, the overlying gum tissue loses its foundation and recedes. This risk is higher in people who already have a thin gum biotype or limited bone thickness on the outer surface of their teeth.
Early orthodontic intervention can actually help prevent recession in some cases by correcting misaligned teeth before bacterial buildup and root contamination make the problem harder to treat. But when orthodontic forces push teeth outside their bony housing, recession can develop during or after treatment. Your orthodontist should evaluate your gum and bone thickness before planning tooth movements that carry this risk.
How to Recognize Recession Early
The most obvious sign is that your teeth look longer than they used to. You may notice more of the root surface becoming visible, or feel a small notch or ledge where the gum meets the tooth. Increased sensitivity to hot, cold, or sweet foods and drinks is common, especially along the gum line. You might also feel discomfort during brushing, flossing, or dental cleanings that you didn’t experience before. These symptoms tend to develop gradually, so comparing how your gum line looks now to how it looked a year or two ago can be a useful reality check.
How Recession Is Treated
Mild recession that isn’t progressing may not need surgical treatment. Addressing the underlying cause, such as switching to a softer brush, quitting smoking, or treating gum disease, can stop further tissue loss. But when roots are significantly exposed, surgical grafting is often the best option.
The connective tissue graft is considered the gold standard. A small piece of tissue is taken from the roof of your mouth (or occasionally from behind the wisdom teeth) and placed over the exposed root. A flap of your existing gum tissue is then positioned over the graft to cover it. This design gives the graft two blood supply sources, one from the tissue bed underneath and one from the flap on top, which improves healing and produces a natural color match with your surrounding gums.
For multiple adjacent teeth with recession, a tunnel technique allows the surgeon to thread a graft beneath your existing gum tissue through a small opening, avoiding the need for incisions between each tooth. This approach preserves more of the blood supply and generally means less post-operative discomfort and scarring. Another option for isolated, narrow defects is a laterally positioned graft, where tissue from an adjacent area with healthy, thick gums is rotated over to cover the exposed root. The success of this approach depends on having enough healthy donor tissue next to the recession site.
Recovery from gum grafting typically involves a week or two of soft foods and limited brushing near the surgical site. The grafted tissue integrates over several weeks, and full healing with a stable new gum line usually takes a few months.