BUTTER-C
Signature ingredients
Potassium nitrate toothpaste OEM/ODM manufacturing
Potassium Nitrate Toothpaste · Signature Ingredients · OEM/ODM
Potassium nitrate (INCI Potassium Nitrate, KNO3) is an inorganic salt that dissolves readily in water and is found in many toothpastes for sensitive teeth; clinical trials usually use 5%. The part believed to act is the potassium ion: the main hypothesis is that potassium ions diffuse along the dentin tubules and stop the nerves in the pulp from firing — a principle with data on animal nerves but never confirmed in intact human teeth. The clinical evidence has also shifted over time: a 2006 Cochrane review concluded there was no clear evidence, while later meta-analyses, with more trials, rated potassium-containing toothpaste at moderate certainty, mainly for tactile stimuli. For brand owners, it is a familiar, low-cost active paired with a sensation-level claim: “helps reduce the feeling of sensitivity in sensitive teeth with daily use”, reviewed by regulatory affairs for each dossier, together with advice to see a dentist. Unlike the sensitive toothpaste page (several actives), this page goes deep into what is specific to potassium nitrate: choosing the accompanying fluoride source and abrasive, checking for nitrite impurities, caution with amines, and storing an oxidizer in the warehouse. The product is positioned for adults. Butter-C offers turnkey OEM/ODM manufacturing, from formulation and testing to a finished, labeled product with its notification dossier.
Formula base
5% potassium nitrate dissolved in a fluoride toothpaste base
Potassium nitrate dissolves in the water phase of the paste; the fluoride source and abrasive are chosen as a compatible pair, in a base that is gentle on sensitive teeth.
Potassium nitrate — reading the raw material correctly
PubChem (CID 24434): KNO3, 101.10 g/mol, CAS 7757-79-1; HSDB data on PubChem give a solubility of 38.3 g/100 g water at 25 °C, soluble in glycerol, very slightly soluble in alcohol; a cooling, saline, pungent taste (Merck Index) and slight hygroscopicity. CosIng lists the functions ORAL CARE and SOOTHING — a declared category, not a claim. Potassium makes up about 38.7% of the mass, so 5% potassium nitrate ≈ 1.93% potassium (a calculation) — used when checking potassium assays. Potassium nitrate is on Butter-C’s ingredient list (INCI Potassium Nitrate); each lot’s certificate of analysis needs content, heavy metals and nitrite impurity.
Fluoride source and abrasive go in pairs
Sodium fluoride goes with hydrated silica: silica is inert towards the fluoride of both sodium fluoride and MFP, while calcium- or aluminum-containing abrasives lost 60–90% of the fluoride from added sodium fluoride solution within a week (Hattab 1989, in vitro). For a calcium carbonate base, use MFP — one trial used 5% potassium nitrate with 1,500 ppm MFP in a precipitated calcium carbonate base (Schiff et al., 1998). With either pair, total and soluble fluoride are measured throughout the stability study. Potassium nitrate is not a fluoride source.
A base that is gentle on sensitive teeth
Low-abrasion silica cleans moderately, thickening-grade silica keeps the paste standing on the brush; sorbitol and glycerin as humectants; cellulose gum or xanthan gum for structure. Abrasive-grade silica for toothpaste is sourced per order: according to the technical data stored in the ingredient list, the hydrated silica Butter-C currently holds is a large spherical grade used as a carrier and oil absorber — not an abrasive grade. Abrasivity follows the supplier’s data sheet and is measured on the finished product when a claim is made.
Foam, flavor and preservation
Sodium Lauryl Sulfate for moderate foam, or Cocamidopropyl Betaine for an SLS-free version; mild mint and low-dose menthol to mask the salty taste of potassium nitrate; sodium saccharin and xylitol for sugar-free sweetness (with no caries claim for xylitol). Sodium Benzoate in oral care products is limited to 1.7% calculated as benzoic acid (Annex VI Ref 1) and its efficacy depends on pH — confirmed by ISO 11930 challenge testing.
Key technical points
Mechanism, evidence, combinations, regulation and safety
These are the points where a potassium nitrate toothpaste differs from an ordinary toothpaste; each is settled by the sources read, the raw material certificates and measurements on the sample.
Mechanism: a potassium-ion hypothesis, unconfirmed in human teeth
On rat spinal nerves in vitro, conduction loss rose with dose over 8–64 mmol/L potassium, with complete, reversible block generally from 32 mmol/L; potassium chloride and potassium nitrate solutions acted the same at equal potassium concentrations (Peacock and Orchardson, 1995). The review by Orchardson and Gillam (2000) notes that the principle of potassium ions diffusing along the tubules to inactivate intradental nerves has never been confirmed in intact human teeth, and that the mechanism of potassium toothpastes remains uncertain. Potassium nitrate is not a tubule-occluding agent (unlike arginine – calcium carbonate).
Evidence: conclusions changed over time
Cochrane review by Poulsen et al. (2006, literature to 2005): a meta-analysis of 6 trials showed a significant effect of potassium nitrate toothpaste on air-blast and tactile sensitivity at 6–8 weeks (air blast: SMD −1.25; 95% CI −1.65 to −0.851), while subjective assessment was not significant; the conclusion was “no clear evidence” because of small numbers and results that varied with the method. Hu et al. (2018; 53 trials, 4,796 adults, against toothpaste without an active): potassium toothpaste relieved symptoms; potassium + strontium and potassium + stannous fluoride were rated “low”, and potassium alone is inferred to be in the “moderate” group from the way the abstract lists them. Martins et al. (2020; 125 trials, 12,541 patients): against fluoride-only toothpaste, potassium was beneficial for the tactile stimulus (SMD 1.23; 95% CI 0.48–1.98), moderate certainty; potassium alone was not among the formulas beneficial for the air stimulus. Pollard et al. (2023; 32 studies, 4,638 adults) recommended twice-daily brushing with stannous, potassium (with or without stannous) or arginine toothpaste; the group of two authors had received consultancy fees or funding from toothpaste manufacturers.
Recent trial, placebo effects and limits
Ishii et al. (2026): randomized, double-blind, negative-control, 127 participants, 8 weeks — 5% potassium nitrate paste, with or without 2.18% aluminum lactate, was significantly lower than placebo from week 2; the combination did better at some time points; the authors were employees of or funded by industry, and the results belong to the whole formula. Some trials show substantial placebo effects (Orchardson and Gillam, 2000). In a 38-person trial, 5% potassium nitrate paste used before and during in-office bleaching did not reduce post-bleaching sensitivity (Ortega-Moncayo et al., 2022) — Butter-C does not position the product for that purpose. 5% is the level in the trials read; there is no checked source on market concentration surveys.
Combination ingredients — Annex III conditions
Sodium fluoride (Ref 31) or MFP (Ref 27): at most “0.15% calculated as F”, with all fluorine compounds added together; label “Contains sodium fluoride” or “Contains Disodium fluorophosphate.” plus the warning for children aged 6 and under. Stannous fluoride (Ref 35): the same 0.15% total F limit, label “Contains stannous fluoride”; potassium + stannous fluoride was beneficial for tactile and air stimuli (Martins 2020) but rated “low” by Hu 2018, the dossier has no stability data, and powdered potassium nitrate is never dry-mixed with tin(II) salts. Strontium chloride (Ref 57): oral hygiene products at most 3.5% calculated as strontium, labels “Contains strontium chloride” and “Frequent use by children is not advisable”; potassium + strontium rated “low” (Hu 2018).
Regulation: nitrate is not nitrite, caution with amines
Name and CAS 7757-79-1 were searched: potassium nitrate is not yet listed in Annexes II, III, VI (version 2026-1) or VII — that does not mean “no limit”. Annex II Ref 248 prohibits “Inorganic nitrites, with exception of sodium nitrite” — nitrites, a different substance from nitrate → Butter-C asks for a nitrite impurity test on the certificate of analysis (internal practice). Annex III Refs 60, 61 and 62 (dialkylamides, monoalkylamines, trialkylamines, trialkanolamines and their salts) state “Do not use with nitrosating systems”; the text does not define the phrase and does not mention nitrate — Butter-C’s cautious practice (not a regulation) is to keep substances from these three entries out of potassium nitrate formulas unless regulatory affairs confirms otherwise.
Raw material and consumer safety
According to classification notifications to ECHA (cited on PubChem), potassium nitrate is an oxidizer that may intensify fire (H272); some notifications list skin, eye and respiratory irritation → stored away from combustible materials and reducing agents, with goggles and masks for whoever weighs the powder. The full text of the 8-week 2026 trial reports no adverse events attributed to the test pastes; long-term data are limited. The CIR ingredient list (checked 17/10/2026) has no potassium nitrate entry, and CosIng lists no SCCS opinion; exposure data from food or fertilizer do not apply to toothpaste. The trials were in adults; children, pregnancy and breastfeeding: not enough data — ask a dentist or doctor.
Three formulation directions
Three potassium nitrate toothpaste lines
Potassium nitrate 5% – sodium fluoride – silica
5% potassium nitrate, sodium fluoride at 1,450 ppm F (about 0.32% NaF corrected for the certificate of analysis), low-abrasion silica, sorbitol, glycerin, Sodium Lauryl Sulfate for moderate foam, mild mint; the everyday line for adults with sensitive teeth.
Potassium nitrate 5% – MFP – calcium carbonate
A calcium carbonate base with MFP, as in the Schiff (1998) trial; an opaque white paste with a lower-cost base than silica. Soluble fluoride must be followed closely because the base contains calcium.
Potassium nitrate – gentle foam, SLS-free
Cocamidopropyl Betaine instead of SLS, sodium fluoride in silica, light flavor; “SLS-free” can be stated as a description of the ingredients; mildness is assessed on the finished product, with no “non-irritating” claim.
Packaging is designed together with the formula
Multi-layer plastic tubes or lined aluminum tubes, screw or flip-top caps; stability studies run in the actual commercial packaging. The carton carries the label wording of the chosen fluoride source, the 6 mm dot and advice to see a dentist if sensitivity persists.
Parameters we monitor
What our R&D team measures on every sample
Below is the set of parameters Butter-C monitors during formula development and scale-up. Specific limits are agreed with you on the approved sample and then written into the product’s in-house specification.
- Incoming potassium nitrate certificate
- Content, heavy metals, nitrite impurity; a grade suitable for oral care products as confirmed by the supplier.
- Potassium nitrate content
- Potassium nitrate (or potassium, factor 0.387) assayed in the finished product at release and after aging.
- Total and soluble fluoride
- Measured with an ion-selective electrode at release, during accelerated aging and in real time in the commercial packaging; checked against 0.15% total F.
- Crystallization
- The paste is inspected after cold cycles, especially in low-water bases — potassium nitrate needs enough free water to stay dissolved.
- pH, viscosity, extrusion
- pH measured on a diluted sample; salts can change the viscosity of anionic polymers (background knowledge) — re-measured after adding potassium nitrate.
- Stability
- Heat–cold cycles, storage at 40°C; watching for water separation, nozzle hardening, color and taste changes.
- Abrasivity
- Per the abrasive supplier’s data sheet; assessed on the finished product when a stain-removal claim is made.
- Microbiology & preservative challenge
- Tested at a GLP/ISO 17025 accredited center; preservative challenge test to ISO 11930.
- Label content
- Check the “Contains …” wording of the fluoride source, the sentence for children aged 6 and under, the 6 mm dot, the ppm F matching the assay and the advice to see a dentist.
Claims
Claims for a potassium nitrate toothpaste
For oral and dental hygiene products, Appendix 03-MP of Circular 06/2011/TT-BYT does not accept claims about preventing or acting on dental abscess, gumboils, gum inflammation, mouth ulcers, periodontitis, pyorrhoea, stomatitis, misaligned teeth or oral infections (an open-ended list), nor claims of whitening tetracycline stains; the text allows claims to be softened toward cosmetic wording. Dentin sensitivity is not named — Butter-C uses only sensation-level wording, reviewed by regulatory affairs for each dossier.
Helps reduce the feeling of sensitivity in sensitive teeth with daily use (reviewed by regulatory affairs for each dossier)
Instead of: instant relief, permanent relief, drug-like claims about sensitivity, percentage reductions borrowed from other studies.
For sensitive teeth; contains potassium nitrate
Instead of: “numbs the tooth nerve”, “blocks the nerve”, “seals dentin tubules”.
Contains fluoride (“helps prevent cavities” only when regulatory affairs confirms)
Instead of: drug-like claims about cavities, “restores enamel”, “fluoride replacement”.
Cleans teeth; mild mint flavor, helps keep breath fresh
Instead of: tooth whitening, drug-like claims about the gums or periodontitis, claims to act on bacteria.
Mandatory label wording by fluoride source
Sodium fluoride (Ref 31): “Contains sodium fluoride” and “Children of 6 years and younger: use a pea-sized amount for supervised brushing to minimise swallowing. In case of intake of fluoride from other sources consult a dentist or doctor.”; MFP (Ref 27): “Contains Disodium fluorophosphate.” and the same sentence (Ref 27 spells it “minimize”). Footnote (12): applies to all toothpaste containing 0.1–0.15% fluoride unless already labeled as contra-indicated for children (e.g. “For adult use only”), with a 6 mm solid circle between the words “pea sized” and “amount”. The Vietnamese wording of the label is confirmed by regulatory affairs.
Directions, warnings and intended users
Brush twice a day, spit out, do not swallow; use consistently for a few weeks (in the 2026 trial, the difference from placebo was clear from week 2). If sensitivity persists, or a cavity or cracked tooth is suspected, see a dentist — dentin sensitivity is identified only after other causes are ruled out, and toothpaste does not replace a dental examination. Stop use if the inside of the mouth becomes irritated. Children, pregnancy and breastfeeding: not enough data — ask a dentist or doctor. Instead of: “replaces a dental visit”, “for the whole family including babies”, “relieves sensitivity after bleaching”.
Manufacturing specifications
Current capabilities
- Textures
- White paste; opaque white paste with a calcium carbonate base.
- Ingredients
- Potassium nitrate and sodium fluoride are on Butter-C’s ingredient list, each lot with a certificate of analysis; abrasive-grade silica and MFP are sourced per order. Potassium nitrate is stored in a separate area for oxidizers.
- Pack formats
- Multi-layer plastic tubes, aluminum tubes, screw or flip-top caps. Fill weight agreed when packaging is selected.
- Minimum order quantity
- Agreed per order and per flavor.
- Testing
- Performed at a GLP/ISO 17025 accredited center, including potassium nitrate, total fluoride and soluble fluoride assays; results delivered with each batch.
- Documentation
- Product information file (PIF) and notification dossier prepared by Butter-C, with the potassium nitrate certificate (including nitrite) and the fluorine calculation sheet.
- Packaging
- Label design, cartons, printing and packing run in parallel with formulation.
Suggested product concept
5% potassium nitrate – sodium fluoride toothpaste for sensitive teeth
One product concept to help you picture the possibilities — not a ready-made product for sale. The actual formula is developed around your brand’s positioning and price range.
5% potassium nitrate as the named ingredient
The level in the clinical trials read; assayed in the finished product for every batch.
Sodium fluoride at 1,450 ppm F
About 0.32% NaF corrected for the certificate of analysis, in a silica base that keeps fluoride soluble.
Low-abrasion silica, mild mint
Moderate cleaning for sensitive teeth; low-dose menthol masks the salty taste of potassium nitrate.
100 g tube and carton
The carton carries “Contains sodium fluoride”, the child warning with the 6 mm dot, “helps reduce the feeling of sensitivity in sensitive teeth with daily use” and advice to see a dentist if sensitivity persists.
Customization options
What you can specify
The same product type can serve very different customers. Tell us your requirements in the areas below and our pharmacists will develop a matching formula.
Potassium nitrate level
5%, as in the trials read; there is no basis for proposing another level without data on the formula itself.
Fluoride source
Sodium fluoride in silica or MFP in calcium carbonate, within 1,000–1,500 ppm F, with all fluorine sources totaling ≤ 0.15%.
Combination ingredients
Stannous fluoride (Ref 35) or strontium chloride (Ref 57) under each entry’s own conditions; a separate stability study is needed, and no “stronger” claim without testing on the finished product.
Flavor
Mild mint, strong mint, mint-free — sensory testing to mask the salty taste.
Foaming agent
Sodium Lauryl Sulfate for moderate foam or SLS-free Cocamidopropyl Betaine (not in Refs 60–62; certificate with amidoamine and DMAPA).
Other actives for sensitive teeth
Arginine – calcium carbonate (tubule occlusion, MFP base) — see the arginine toothpaste page; an overview of actives is on the sensitive toothpaste page.
Further reading
Related knowledge
Potassium nitrate in toothpaste for sensitive teeth
Mechanism, Cochrane and later meta-analyses, safety, claims and ASEAN regulation (in Vietnamese).
Sensitive toothpaste OEM/ODM manufacturing
Actives for sensitive teeth and gentle bases; this page focuses on potassium nitrate.
Arginine toothpaste OEM/ODM manufacturing
A sensitive-teeth active based on tubule occlusion, in a calcium carbonate base with MFP.
Sodium fluoride toothpaste OEM/ODM manufacturing
Converting sodium fluoride to fluorine, a compatible silica base and label warnings.
Sodium fluoride in cosmetics
Dental data, the 0.15% F limit and ASEAN label wording (in Vietnamese).
Daily oral care routine
Brushing, fluoride and dental visits per public recommendations (in Vietnamese).
Circular 06/2011/TT-BYT
Appendix 03-MP: claims not accepted for oral care products (in Vietnamese).
How we work
From idea to finished batch
Eight steps and three milestones signed off by both sides: approved sample, notification number, finished batch. Step-by-step details →
Get started
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