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Sodium benzoate and SLS in toothpaste
Since cocamidopropyl betaine is known to counteract the “harshness” of SLS, I was thinking of using the following in a toothpaste.
I would want to use the same combination whether making a calcium carbonate or silica-based toothpaste…
0.5% SLS
0.5% cocamidopropyl betaine
0.3% sodium benzoate
I this a good idea, or a horrible idea?
I await response(s) with baited breath 🤩.
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3 Replies
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CB is gentle but not for eczema, I love castille soap for toothpaste. I’m not sure if it works in anything other than homemade toothpaste but its super gentle.
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CAPB is one of the mildest avaliable surfactants. It can produce some skin issues to people with specific skin allergy to the ingredient, which is rare. To be safe, always formulate it along an anionic surfactant (wich will hinder both polar heads by forming a mixed micellar system) and at a low pH (which will neutralize amidoamines and other basic impurities, which can be present in traces). Also, regarding the safety of soaps, better take a look at the available evidence like this CIR review: cir-reports.cir-safety.org/view-attachment/?id=3a3ac6dd-8c74-ec11-8943-0022482f06a6. Our own experience is considered as anecdotal evidence, which is the lowest level of evidence possible. We always need to search for systematic reviews on the topic (like this one from CIR or the Opinions from the SCCs of the EU).
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I find the amount you need to use depends very much on the taste of the finished product and also how much it foams and adjust the amount accordingly.
If, you are using essential oils to flavour, you may require more SLS/CAPB - the oils seem to knock the foaming back a bit, you may find you are using too much if you use a commercial flavour.
Also, if you are going for fruity flavours (or non-mint flavours) you may find the flavours of the SLS/CAPB come through a bit more and you may need to adjust.
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