Coconut Oil (SCI): The Natural Ingredient That Protects and Refreshes Your Smile

Quick summary

• SCI is a gentle surfactant derived from coconut oil: it cleans and foams with low irritation.
• In quality toothpastes, it helps dislodge biofilm and distribute active ingredients throughout the mouth.
• Its foam is fine, creamy, and stable, improving the brushing experience and the subsequent feeling of cleanliness.
• It is suitable for sensitive gums and compatible with active ingredients such as fluoride, xylitol, silica, or calcium carbonate.
• It has safety assessments (CIR 1993; amended review 2017) that support its use in personal and oral care.
• Pure coconut oil (oil pulling) can be an adjunct, but does not replace toothpaste or fluoride.
• Find our formulas with SCI: /collections/all.

What is SCI (Sodium Cocoyl Isethionate)?

Sodium Cocoyl Isethionate (SCI) is a gentle anionic surfactant derived from fatty acids of coconut oil. In cosmetics and personal care, it is valued for its ability to reduce water surface tension, emulsify fats, and promote the removal of dirt and biofilms with a low irritation profile compared to traditional sulfates.

In toothpaste formulation, the surfactant is not "what cleans on its own," but rather what helps brushing remove plaque and distribute the toothpaste: it stabilizes foam, solubilizes aromatic oils, facilitates contact of abrasives with the tooth surface, and contributes to a pleasant sensation during and after brushing. SCI performs this function with a characteristic creamy feel and generally superior tolerance to more aggressive surfactants.

Its isethionate head and its C12–C14 chains (typical of coconut) determine an HLB balance that produces stable micelles with good foaming capacity and less delipidizing potential on mucous membranes compared to classic sulfates. That is why it is used in sulfate-free toothpastes and formulas for sensitive gums.

Properties and benefits of SCI in toothpastes

Gentle cleansing and foaming agent

SCI forms micelles that surround and trap hydrophobic compounds present in the oral biofilm, which facilitates their mechanical detachment by the brush. Its foam is fine and creamy, allowing the toothpaste to spread evenly over tooth surfaces and interdental spaces. In practice, this translates into a more uniform feeling of cleanliness and better rinsing afterwards, without a persistent "detergent" sensation.

It is important to remember that foam is not synonymous with "more cleaning," but it does provide functional benefits: it indicates coverage, facilitates the mobilization of debris, and helps keep flavors and functional agents (such as xylitol or essential oils) in contact with the surfaces. The quality of SCI foam — creamy and stable — is especially pleasant for users seeking a less aggressive sensory experience.

In formulation, low percentages of SCI are usually used, adjusted with co-surfactants and humectants (glycerin, sorbitol) to balance foam, rheology, and tolerance. The final pH of the toothpaste and the abrasive system determine much of the comfort during brushing, and SCI integrates well into this overall balance.

Compatibility with enamel and gums

One of the reasons SCI is gaining popularity in oral hygiene is its reduced irritation profile when compared to high-potency sulfates. The integrity of the oral mucosa and the salivary film is key to comfort; overly delipidizing surfactants can favor a feeling of dryness or irritation in susceptible users. In this scenario, SCI is known for a less aggressive action on the mucosal barrier, better preserving post-brushing comfort.

Regarding enamel, a distinction must be made: the surfactant does not "wear down" the tooth; abrasivity is determined by the abrasive system (silica, calcium carbonate, bicarbonate, etc.) and its RDA. The role of SCI is to facilitate the detachment of biofilm and debris, in a way that is compatible with enamel and comfortable for the gums. In well-designed formulas (pH 6–8, correct humectants, balanced flavorings), SCI is suitable for sensitive gums and for users who prefer to avoid strong sulfates.

In addition, SCI often synergizes with amphoteric surfactants (e.g., cocamidopropyl betaine) to adjust foam, further reduce irritating potential, and modulate system viscosity. This synergy allows for a pleasant lathering with gentle friction during brushing.

SCI vs. other surfactants (SLS, SLES, CAPB)

In summary: if you are looking for a gentle experience with good foam and a clean feeling that doesn't dry, SCI is an excellent surfactant base for modern toothpastes.

What about "pure" coconut oil? (oil pulling)

Oil pulling is a traditional Ayurvedic practice that involves holding oil (often coconut oil) in the mouth for several minutes and then expelling it. Some preliminary studies have observed reductions in plaque and gingivitis indices when used as an adjunct to oral hygiene, likely due to emulsification mechanisms of the biofilm and effects on certain oral microorganisms.

However, it is crucial not to confuse: the reported effect of coconut oil in oil pulling is not equivalent to that of SCI. SCI is a specific and standardized surfactant, designed to be integrated into a complete formula that includes controlled cleaning abrasives, fluoride or other active ingredients, humectants, flavors, and pH regulators. Oil pulling, by itself, does not provide fluoride, does not control abrasiveness, and does not replace brushing or flossing.

If you are interested, it can be considered as an occasional supplement, but it should not replace a formulated toothpaste. Furthermore, in specific populations (children, people at risk of aspiration), it is not recommended.

Safety and regulatory status

The Cosmetic Ingredient Review (CIR) evaluated SCI in 1993 and, subsequently, in an amended review in 2017 within the group of isethionate salts. The key conclusions for use in personal hygiene products (including oral care) are:

• SCI is safe at current use concentrations and practices when formulated not to irritate.
• Its toxicological profile is favorable: low systemic absorption and good safety margin under normal use conditions.
• The final formulations (pH, co-surfactants, humectants) are decisive for tolerance in skin and oral mucosa.

In toothpastes, these opinions support the inclusion of SCI as a gentle surfactant, particularly in sulfate-free proposals and for sensitive gums. As always, actual safety does not depend on a single ingredient but on the complete design of the formula and its quality control.

Frequently asked questions

Is SCI just "for making foam"?

No. Foam is useful for distributing the toothpaste, but SCI is there to remove plaque and debris with low irritation, stabilize flavors, and improve the sensory experience. Cleaning is the result of the synergy between surfactant + abrasive + brushing.

Can coconut oil replace toothpaste?

No. Oil pulling can be an adjunct, but it does not provide fluoride or abrasiveness control. It does not replace brushing with toothpaste, interdental hygiene, or professional check-ups.

Does SCI cause sensitivity?

SCI is a gentle surfactant. Tooth sensitivity is usually related to enamel erosion/abrasion, gingival recession, or habits (acids, bruxism), not SCI itself. In well-formulated toothpastes, SCI does not increase sensitivity and can improve tolerance compared to strong sulfates.

Who is a toothpaste with SCI ideal for?

For those looking for a gentle experience without sacrificing cleaning: sensitive gums, users who prefer sulfate-free, or those who want a pleasant, creamy foam with less post-brushing dryness.

Curiosities

• SCI is sulfate-free and became popular in "gentle care" shampoos and facial cleansers; its adoption in toothpastes came later, seeking better tolerance in mucous membranes.
• Its foam is described as "micro-creamy": it produces fine, stable bubbles that improve coverage and the feeling of uniform cleanliness.
• It combines very well with amphoterics (like CAPB) and with humectant systems (glycerin/sorbitol), which helps to adjust rheology and comfort during brushing.
• In formulation, the balance between foam, abrasiveness, pH, and flavor is what defines the experience; SCI fits well into that equation.

Conclusion

SCI provides effective cleaning with very good tolerance, a pleasant foam, and a modern sensory experience. It does not replace anti-cavity active ingredients or controlled cleaning abrasives, but it helps everything work better together. If you prioritize gentleness and daily effectiveness, SCI is an excellent surfactant base. Discover our formulas: /collections/all.

1. Cosmetic Ingredient Review (CIR). Final Report on the Safety Assessment of Sodium Cocoyl Isethionate. Journal of the American College of Toxicology. 1993;12(5). DOI: 10.3109/10915819309141599.
2. Burnett CL, et al. Amended Safety Assessment of Isethionate Salts as Used in Cosmetics. 2017. Conclusion: safe under current use practices and concentrations, when formulated not to irritate. PubMed.
3. Peedikayil FC, Sreenivasan P, Narayanan A. Effect of Coconut Oil in Plaque Related Gingivitis—A Preliminary Report. J Nat Sci Biol Med. 2015;6(1):12–15. PMC.