Is Baking Soda Good for Your Gums?

Baking soda does appear to be good for your gums, and the evidence behind this goes beyond folk wisdom. Multiple clinical trials and systematic reviews have found that toothpastes containing sodium bicarbonate outperform conventional toothpastes at removing plaque and reducing gum bleeding. The story is more nuanced than a blanket endorsement, though, because how you use baking soda, in what form, and what you expect it to accomplish all matter.

Plaque Removal Is Where the Evidence Is Strongest

The most robust case for baking soda and gum health comes from its effect on plaque, the sticky bacterial film that drives gum disease when it builds up along the gumline. A systematic review pooling data from multiple clinical experiments found that baking soda toothpastes removed significantly more plaque than both standard fluoride toothpastes and other non-baking-soda formulations.¹ That advantage held whether the comparison was a basic toothpaste or one with active anti-plaque ingredients, which is a meaningful distinction. Beating a placebo is expected; beating products designed to do the same job suggests the effect is real.

The mechanism is partly physical and partly chemical. Baking soda crystals are relatively soft compared with your tooth enamel, but they dissolve during brushing and get into crevices that larger abrasive particles miss. A review in the Journal of the American Dental Association concluded that baking soda dentifrices are effective at disrupting plaque biofilm and noted that the ingredient is inexpensive, widely available, and highly compatible with oral tissues.² It also has mild antibacterial properties specific to certain oral bacteria, which may help prevent plaque from re-forming as quickly after brushing.

Less Bleeding and Reduced Inflammation

Plaque removal alone would be enough to benefit your gums, since plaque is the primary irritant that causes gingivitis. But several trials have measured gum outcomes directly, and the results are encouraging. A 12-week randomized trial comparing a sodium bicarbonate toothpaste against a conventional fluoride toothpaste found that the baking soda group experienced significantly greater reductions in bleeding sites, bleeding index, and gum inflammation at every measured time point, from three weeks through the end of the study.³

Another trial using a toothpaste with 20% baking soda reported that after 12 weeks, gum bleeding dropped by roughly 44% compared with the control toothpaste, alongside meaningful reductions in both gum inflammation and plaque scores.⁴ A separate trial testing a sodium bicarbonate toothpaste that also contained sodium hyaluronate and fluoride found significant improvements in all gingivitis measures after just six weeks compared with a standard fluoride toothpaste.⁵

The pattern across these studies is consistent: baking soda toothpastes tend to reduce gum inflammation and bleeding more than regular toothpastes, and the benefits show up within a few weeks. That said, the systematic review of gingival index scores specifically did not find a significant difference, which suggests that the improvements, while real, may be moderate in size and depend somewhat on which measure you look at.¹ Researchers have noted that longer follow-up trials would help clarify whether these gains hold over months and years.⁶

Why Raising Your Mouth’s pH Helps

One of baking soda’s most distinctive properties is that it is alkaline. When dissolved in water, it nudges the pH upward. In the mouth, this matters because the bacteria most harmful to gums and teeth thrive in acidic conditions. After eating or drinking, salivary pH can drop into ranges where harmful bacteria multiply faster and tooth enamel becomes vulnerable. Using a baking soda rinse has been shown to raise salivary pH significantly.⁷

The pH shift creates an environment that is less hospitable to acid-producing bacteria and more favorable to the kinds of bacteria associated with healthy gums. Think of it as tilting the playing field rather than wiping out all the players. Your mouth is an ecosystem, and small environmental changes can shift which organisms flourish.

How dramatic this effect is depends on the individual. A study examining baking soda mouth rinses in smokers found that pH changes from baseline to follow-up were modest and not statistically significant.⁸ Smoking alters oral chemistry in ways that may blunt the buffering effect, so the pH benefits of baking soda are probably more pronounced for non-smokers. If you smoke, baking soda rinses are unlikely to compensate for the broader oral damage tobacco causes.

Is Baking Soda Safe for Your Enamel?

A common concern is that baking soda is too abrasive and will wear down tooth enamel over time. The evidence suggests the opposite. Baking soda crystals are softer than both enamel and dentin, the layer underneath enamel. A review evaluating abrasivity concluded that baking soda has an intrinsically low-abrasive nature because of this hardness difference.⁹ The crystals also dissolve readily in water, so they break apart during brushing rather than scratching the tooth surface the way harder particles would.

People sometimes worry that adding baking soda to their routine will interfere with fluoride, the ingredient most responsible for cavity prevention. An in situ study directly tested this by comparing a toothpaste containing both fluoride and baking soda against a fluoride-only toothpaste and a placebo. The combined formulation worked just as well as fluoride alone at preventing enamel demineralization and promoting remineralization. Baking soda neither improved nor impaired fluoride’s protective effect.¹⁰ So if you choose a baking soda toothpaste that also contains fluoride, you’re getting the plaque and gum benefits without sacrificing cavity protection.

Baking Soda Rinses and Their Limits

Some people skip the toothpaste entirely and mix baking soda with water for a mouth rinse. This can raise salivary pH, as noted earlier, and create a cleaner-feeling mouth. But the evidence supporting rinses is thinner than the evidence supporting baking soda toothpastes. When you brush with a baking soda formulation, you get both chemical action and the physical disruption of plaque. A rinse gives you only the chemical component, without the mechanical scrubbing that does the heavy lifting in plaque removal.

One area where baking soda rinses have been widely used is in cancer patients undergoing chemotherapy or radiation, who often develop painful mouth sores called oral mucositis. The thinking was that raising mouth pH would help prevent or treat these sores. A systematic review found no evidence that baking soda rinses actually help with oral mucositis, and cautioned that the sudden pH increase could be counterproductive and delay more effective treatments.¹¹ This is a case where a plausible-sounding home remedy does not hold up under scrutiny. If you’re dealing with mouth sores from cancer treatment, talk to your oncology team rather than reaching for baking soda.

A Side Benefit for Bad Breath

Chronic bad breath often comes from volatile sulfur compounds produced by bacteria on the tongue and around the gumline. Since baking soda shifts the oral environment away from conditions that favor these bacteria, it can reduce mouth odor. Controlled studies using both sensory panels and gas chromatography found that toothpastes with high baking soda concentrations reduced oral malodor.¹² If your bad breath is primarily bacterial in origin rather than caused by diet, stomach issues, or dry mouth, a baking soda toothpaste could make a noticeable difference.

If You Have Fillings, Crowns, or Veneers

People with dental restorations sometimes wonder whether baking soda toothpastes will roughen or damage composite fillings, crowns, or veneers. An in vitro study simulating thousands of brushing cycles found that surface roughness increased for all toothpaste groups, including both whitening and conventional formulations. The increase in roughness did not differ significantly between the baking soda and non-baking-soda groups.¹³ In practical terms, any toothpaste causes some microscopic surface wear on composite materials over time, and baking soda does not appear to make this worse. If you have porcelain or ceramic restorations, which are much harder than resin composites, abrasion from a low-abrasive agent like baking soda is even less of a concern.

Baking Soda in the Dental Office

Your dentist or hygienist may use baking soda in a form you would never try at home: air polishing. This involves spraying a pressurized stream of fine sodium bicarbonate powder (mixed with water and air) onto tooth surfaces and beneath the gumline to blast away plaque and staining. A systematic review acknowledged that subgingival biofilm control through air polishing is considered an important adjunct in periodontal therapy.¹⁴ Professional air polishing reaches areas that a toothbrush cannot, particularly below the gumline in patients with gum pockets caused by periodontal disease. While newer, finer powders like glycine and erythritol have gained popularity for subgingival use because they are even gentler on soft tissue, sodium bicarbonate remains a common and effective option for above-the-gumline polishing.

Straight Baking Soda vs. Baking Soda Toothpaste

There is a difference between dipping your toothbrush into a box of Arm & Hammer from the kitchen and using a commercially formulated baking soda toothpaste. Most of the clinical evidence supporting gum benefits involves toothpastes that contain baking soda alongside other ingredients, including fluoride, surfactants, and flavor agents. These formulations are engineered to deliver a consistent concentration of sodium bicarbonate in a form that stays on the brush and reaches the right areas.

Using pure baking soda as a paste is unlikely to harm you, given its low abrasivity, but you miss out on fluoride unless you supplement it separately. The taste is also intensely salty and unpleasant for most people, which tends to shorten brushing time, and time spent brushing matters at least as much as what you brush with. If gum health is your goal, a commercially available baking soda toothpaste that also contains fluoride gives you the best combination of plaque disruption, pH buffering, and cavity protection without making you dread brushing.

Another consideration is concentration. The trials showing the clearest gum benefits used toothpastes with substantial baking soda content, with some formulations containing 20% or more. Not every toothpaste that lists baking soda on the label includes enough to produce the effects seen in the research. If you are choosing a product specifically for your gums, look for brands where baking soda is featured as a primary active ingredient rather than a minor addition near the bottom of the ingredient list.

What Baking Soda Cannot Replace

For all its benefits, baking soda is not a treatment for established periodontal disease. Gingivitis, the early stage of gum disease characterized by red, swollen, bleeding gums, can often be reversed with better brushing habits, and a baking soda toothpaste can accelerate that reversal. But once gum disease has progressed to periodontitis, where the bone and connective tissue supporting your teeth have begun to break down, no toothpaste alone will reverse the damage. That requires professional intervention: scaling and root planing, possibly antibiotics, and in advanced cases, surgery.

Baking soda also does not address the structural factors that contribute to gum problems in some people. Crowded or misaligned teeth create tight spaces that harbor plaque regardless of toothpaste chemistry. Hormonal changes during pregnancy, poorly controlled diabetes, and certain medications like anticonvulsants or calcium channel blockers can all cause gum swelling that no amount of baking soda will resolve. The ingredient works best as part of a broader routine that includes flossing or interdental brushes, regular dental visits, and attention to the systemic factors that affect your mouth.

If your gums bleed when you brush and you have not seen a dentist recently, switching to a baking soda toothpaste is a reasonable first step, but not a substitute for a professional evaluation. Persistent gum bleeding can be an early warning sign of periodontitis, and the sooner it is caught, the less damage it does. Baking soda can help you maintain healthy gums and tip mild gingivitis back toward normal, but expecting it to fix serious gum disease on its own would be putting too much faith in a kitchen staple, however useful it happens to be.