Baking soda in a commercial toothpaste can be used every day. Multiple reviews of the dental literature have concluded that baking soda dentifrices fall well within established safety limits for abrasiveness and are suitable as part of a daily brushing routine. The picture changes somewhat when you’re mixing plain baking soda from your kitchen into a DIY paste, though, because concentration, grit size, and the absence of fluoride all shift the risk-benefit calculation in ways worth understanding.
Daily Use in a Toothpaste Is Well Supported
If you’re using a store-bought toothpaste that lists sodium bicarbonate as an ingredient, you can brush with it as often as you normally brush, typically twice a day. A review published in the Journal of the American Dental Association found that baking soda-based dentifrices are a “desirable, alternative or additional measure for tooth stain removal and whitening” as part of daily oral hygiene.1PubMed. Stain removal and whitening by baking soda dentifrice: A review of literature A companion paper in the same journal examined how abrasive these products are and concluded that even the most abrasive baking soda toothpaste formulations have abrasivity well within the safety limits established by regulatory agencies.2PubMed. Baking soda as an abrasive in toothpastes: Mechanism of action and safety and effectiveness considerations
A separate review went further, calling baking soda dentifrices “ideal candidates to be considered as a universal dentifrice” because the ingredient is inexpensive, highly biocompatible, has low abrasivity, and is effective at removing plaque biofilm.3PubMed Central. Effect of baking soda in dentifrices on plaque removal So the short version is that commercial baking soda toothpastes are designed for daily use, and the evidence backs that up.
DIY Baking Soda Paste Is a Different Story
A lot of people asking this question are not using a commercial product. They’re dipping a wet toothbrush into a box of Arm & Hammer from the pantry, or mixing baking soda with water into a paste, and wondering how many times a week they can get away with it. The answer here is less clear-cut, because you lose several safeguards that manufactured toothpastes provide.
First, concentration matters. An in vitro study that tested sodium bicarbonate at different concentrations found that at 35% and 50%, it did not increase enamel surface roughness or reduce hardness compared to controls, supporting its safety for plaque and stain removal at those levels. But at 70% concentration, surface roughness was significantly higher than both the control and the 35% group.4PubMed. Effect of sodium bicarbonate on tooth surface roughness and microhardness When you scoop baking soda straight from the box and brush with it, you’re likely working at a very high concentration, well above what commercial formulations use. That doesn’t mean it will destroy your enamel in a single session, but it does mean that doing it twice a day indefinitely carries more risk than the same habit with a manufactured toothpaste.
Second, food-grade baking soda has a coarser particle size than the milled sodium bicarbonate used in commercial toothpastes. Manufacturers process their baking soda into finer, more uniform particles, which is part of why their abrasivity scores stay low. Kitchen baking soda hasn’t gone through that refinement.
Third, a DIY baking soda paste contains no fluoride. Fluoride is the single best-studied ingredient for cavity prevention, and skipping it long-term to use a plain baking soda paste means giving up meaningful protection against decay. If you want to use straight baking soda occasionally for whitening, a reasonable approach is to limit it to a few times per week and make sure your primary toothpaste still contains fluoride.
How Baking Soda Actually Cleans Your Teeth
Baking soda works through two mechanisms that are distinct from most toothpaste ingredients. The first is physical: sodium bicarbonate crystals are softer than enamel and softer than many other abrasives used in toothpaste, but still hard enough to scrub off surface stains and the sticky biofilm that bacteria form on teeth. Because the crystals are relatively soft and dissolve in water, they tend to break apart during brushing rather than gouging enamel the way harder abrasives can.
The second mechanism is chemical. Baking soda is alkaline, with a pH around 8.3 when dissolved in water. Most of the damage bacteria do to teeth happens in an acidic environment. After you eat or drink something sugary, oral bacteria produce acids that lower the pH in your mouth, which can start dissolving enamel minerals. A study on sodium bicarbonate oral rinses found that salivary pH increased significantly after use, pushing the mouth back toward a more neutral environment.5PubMed Central. The effect of sodium bicarbonate oral rinse on salivary pH and oral microflora: A prospective cohort study This buffering effect helps create conditions where enamel can remineralize rather than continue breaking down.
Baking soda also appears to have genuine antibacterial properties. Lab testing showed substantial inhibitory activity against Streptococcus mutans, one of the primary bacteria responsible for cavities. The effect wasn’t just from the saltiness or the high concentration of dissolved particles; it was specific to baking soda’s chemistry. When baking soda was combined with a detergent (the kind already found in most toothpastes), it caused significant killing of bacterial cells.6PubMed. Antibacterial activity of baking soda These findings suggest that brushing with baking soda may help keep cavity-causing bacteria in check, beyond just physically scrubbing them away.
What the Evidence Says About Plaque and Gum Health
A systematic review and meta-analysis pooling results from multiple clinical trials found that baking soda dentifrices removed plaque significantly better than both standard toothpastes and toothpastes with other active ingredients. The review also found improvements in gingival bleeding scores when baking soda toothpaste was compared to negative controls.7PubMed Central. The efficacy of baking soda dentifrice in controlling plaque and gingivitis: A systematic review So there’s a measurable clinical benefit beyond just making teeth look whiter. Less plaque and less bleeding around the gums are markers of genuinely healthier gums.
That said, the meta-analysis did not find significant differences in the gingival index itself, which is a broader measure of gum inflammation beyond just bleeding. The takeaway is that baking soda toothpastes are demonstrably good at removing plaque and reducing bleeding, but they’re not a magic bullet for advanced gum disease. If you already have periodontitis, baking soda toothpaste is a solid daily tool, not a substitute for professional treatment.
When Baking Soda Calls for Extra Caution
While the enamel on the crown of your tooth handles baking soda well, exposed root surfaces are more vulnerable. Root dentin is softer than enamel, and a study examining the effect of different toothpastes on eroded root dentin found that baking soda caused increased surface roughness comparable to other abrasive products tested. Root dentin that had already been softened by acid exposure was especially susceptible to wear from brushing.8PubMed. Abrasion of eroded root dentine brushed with different toothpastes If you have gum recession exposing root surfaces, or if your teeth are frequently bathed in acid from conditions like acid reflux or frequent citrus consumption, the calculus on frequency changes. In those situations, using baking soda less often and choosing a low-abrasivity fluoride toothpaste as your primary product makes more sense.
Timing also matters. Brushing with any abrasive immediately after consuming acidic foods or drinks is riskier, because acid temporarily softens the outer layer of enamel. Waiting at least 30 minutes after an acidic meal before brushing gives your saliva time to neutralize the acid and allows the enamel surface to reharden. This advice applies to all toothpastes, but it’s especially worth remembering if you’re using a DIY baking soda paste at a higher-than-commercial concentration.
Baking Soda and Orthodontic Brackets
If you wear braces, baking soda introduces a specific concern that has nothing to do with your enamel. Sodium bicarbonate can weaken the bond between orthodontic brackets and tooth surfaces. A clinical trial that tracked bracket failures over 12 months found that teeth cleaned with sodium bicarbonate before bracket placement had higher failure rates than those cleaned with erythritol. The in vitro portion of the same study confirmed that sodium bicarbonate produced the lowest shear bond strength values among the agents tested.9PubMed Central. Effect of different enamel pretreating agents on bonding efficacy and survival rates of orthodontic brackets: In vitro study and split-mouth randomized clinical trial
This finding is about surface preparation before bonding, not about daily brushing with braces already in place. But it raises a reasonable concern: regularly bathing the area around brackets in an alkaline solution that may interfere with adhesive chemistry is something to discuss with your orthodontist. Many orthodontists prefer patients to use a standard fluoride toothpaste during active treatment and save baking soda experiments for after the braces come off.
Does It Actually Whiten Teeth?
Baking soda removes extrinsic stains, which are the surface discolorations from coffee, tea, red wine, and tobacco. It does this through gentle abrasion and, to some extent, through its alkaline chemistry breaking down stain-causing compounds. An in vitro study using baking soda with an electric toothbrush for stain removal found no significant change in enamel surface roughness across the experimental groups, suggesting that the whitening effect came without meaningful enamel damage.10PubMed Central. Combined use of baking soda and electric toothbrushing for removal of artificial extrinsic stain on enamel surface: An in vitro study
What baking soda does not do is change the intrinsic color of your teeth. If your teeth are naturally yellow or have darkened from aging, medication (like tetracycline), or internal trauma, baking soda won’t help with that. Intrinsic whitening requires bleaching agents like hydrogen peroxide or carbamide peroxide that penetrate into the tooth structure. Some commercial baking soda toothpastes add low concentrations of hydrogen peroxide for this reason. At low concentrations in daily-use products like toothpastes and mouth rinses, hydrogen peroxide has a good safety profile and does not damage oral hard or soft tissues.11PubMed Central. Safety issues relating to the use of hydrogen peroxide in dentistry
The practical implication: if your goal is whiter teeth, baking soda alone will only get you partway there. It can strip surface stains effectively, which for a coffee drinker might be the difference between dingy and bright. But for deeper color change, you’d need a peroxide-based whitening product, whether over-the-counter strips, custom trays from a dentist, or an in-office procedure.
What About Using It After Oral Surgery?
One situation where baking soda products may offer a specific advantage is after gum surgery. A clinical study compared a baking soda-peroxide dentifrice to a standard toothpaste following gingival flap surgery and found statistically significant improvement in wound healing at seven days with the baking soda product, with the trend continuing to day fourteen.12e-Publications@Marquette. Effect of Baking Soda-Peroxide Dentifrice on Post-Surgical Wound Healing The researchers noted that plaque levels did not differ significantly between the groups during the study, suggesting the healing benefit came from the product’s chemistry rather than from better plaque control.
The alkaline environment created by baking soda likely plays a role here. Wound healing tends to proceed better in a less acidic environment, and baking soda’s buffering capacity may support that. If you’ve had periodontal surgery and your dentist hasn’t given you specific post-operative product instructions, asking about a baking soda toothpaste is a reasonable conversation to have. Don’t use a coarse DIY paste on healing surgical sites, though: stick with a commercial product with fine particles.
Common Mistakes People Make With Baking Soda
A few patterns come up repeatedly among people who use baking soda for oral care, and most of them stem from the same misunderstanding: treating baking soda like a natural cure-all and overusing it.
- Scrubbing too hard: Baking soda’s abrasive action depends on the crystals making contact with the tooth surface, not on how much force you apply. Pressing harder doesn’t clean better; it just wears down enamel and irritates gums. Light pressure is all you need.
- Replacing fluoride entirely: Some people switch to plain baking soda because they want a “chemical-free” routine. Fluoride is the most effective anti-cavity agent available in a toothpaste, and removing it from your routine increases your risk of decay regardless of how well baking soda handles plaque and stains.
- Using it right after acidic food: As noted earlier, acid softens enamel temporarily. Brushing with an abrasive while the surface is softened causes more wear than the same brushing on a fully remineralized surface. Wait at least half an hour.
- Adding lemon juice: This is a popular DIY whitening recipe that circulates online. Lemon juice is highly acidic, and mixing it with baking soda doesn’t neutralize the acid enough to make it safe. You end up brushing an abrasive paste onto acid-weakened enamel, which is about the worst combination you can create for your teeth.
Putting Together a Sensible Routine
For most people, the most practical approach is to use a commercial baking soda toothpaste with fluoride as your everyday product. You get the plaque-removal and stain-fighting benefits of sodium bicarbonate, the cavity protection of fluoride, and the safety of a formulation that’s been engineered to stay within established abrasivity limits. You can brush with it twice a day, every day, without concern.
If you prefer using plain baking soda from the box for occasional whitening, two to three times per week is a reasonable limit for people with healthy enamel and no exposed roots. Use a light touch, mix it with just enough water to form a paste rather than packing it on dry, and keep a fluoride toothpaste in rotation for the other brushings. If you have gum recession, acid erosion, sensitive teeth, or active orthodontic treatment, lean more heavily on the fluoride toothpaste and check with your dentist before adding baking soda into the mix.
One final note on expectations: baking soda is genuinely useful for oral hygiene. The research supports its effectiveness for plaque removal, surface stain reduction, and creating a less acidic oral environment. But it isn’t doing anything that a good fluoride toothpaste can’t also do in terms of cavity prevention, and for deep whitening it falls short of peroxide-based products. Think of it as a helpful tool in the toolbox, not the only tool you need.