Toothpaste Ingredients You're Swallowing Every Day

Here's something most people don't think about: you swallow a small amount of toothpaste every time you brush. Studies estimate adults ingest roughly 10-15% of the toothpaste they use per session. Kids swallow significantly more. That means whatever's in your toothpaste isn't just sitting on your teeth — it's entering your body, twice a day, every day.

So what's actually in there?

Sodium Lauryl Sulfate (SLS)

SLS is a foaming agent. It's the reason toothpaste lathers up, which feels satisfying but has zero impact on cleaning ability. What it does do: SLS strips the protective mucous lining inside your mouth, which is why some people get canker sores more frequently when using SLS toothpaste. Multiple studies have shown that switching to SLS-free toothpaste significantly reduces canker sore recurrence. If you get mouth ulcers regularly, this is the first ingredient to ditch.

Artificial Sweeteners

Most conventional toothpastes use saccharin — yes, the same stuff in those pink Sweet'N Low packets. It's there to mask the taste of other ingredients. While the cancer scare around saccharin from the 1970s has been largely walked back, there's a reasonable argument that you don't need artificial sweeteners in something you put in your mouth 700+ times a year.

Artificial Colors

Why is toothpaste blue? Or bright red? Or striped with three colors? Because it looks appealing on the shelf. FD&C Blue No. 1 and other synthetic dyes serve absolutely no functional purpose in toothpaste. They exist for marketing. Meanwhile, some artificial colors have been linked to behavioral issues in children and are restricted in Europe. Seems like a weird trade-off for aesthetics in a product you spit out.

Triclosan

This one deserves special attention. Triclosan is an antibacterial agent that was the star ingredient in Colgate Total for years. It's an endocrine disruptor — meaning it interferes with your hormones, particularly thyroid function. The FDA banned triclosan from hand soaps in 2016, but it took until 2019 for Colgate to reformulate Total without it. If you're using an old tube or a knockoff brand, check for it.

The Fluoride Question

I'm going to be honest here because this topic gets polarized fast. Fluoride does prevent cavities. The research on that is solid and decades deep. The concern isn't whether fluoride works on teeth — it's about systemic exposure. Fluoride is already in most municipal water supplies, and the cumulative effect of fluoride from water, toothpaste, dental treatments, and food is where some researchers raise flags. The dose makes the poison, as they say.

For people who want to minimize their fluoride exposure without sacrificing cavity protection, there's a legitimate alternative that's been used in Japan for decades.

Hydroxyapatite: The Science-Backed Alternative

Nano-hydroxyapatite (nHAp) is the same mineral that makes up 97% of your tooth enamel and 70% of your dentin. When you brush with nHAp toothpaste, you're essentially giving your teeth back the building blocks they're made of. It fills microscopic cracks, remineralizes enamel, and reduces sensitivity.

This isn't fringe science. Japan has approved hydroxyapatite as an anti-cavity agent since the 1990s. Multiple peer-reviewed studies show it performs comparably to fluoride for remineralization and cavity prevention. A 2019 study in the British Dental Journal found nHAp toothpaste was as effective as fluoride toothpaste at remineralizing initial enamel lesions.

The reason you haven't heard more about it in the US is largely regulatory inertia and market dynamics. The FDA hasn't approved it as an anti-cavity agent (which means nHAp toothpastes can't make cavity prevention claims on US labels), but the research speaks for itself.

What to Look For

A clean toothpaste should have:

• No SLS or SLES
• No artificial sweeteners (saccharin, aspartame)
• No artificial colors
• No triclosan
• Either fluoride or nano-hydroxyapatite for remineralization
• A short, recognizable ingredient list

Our Pick

We recommend Davids Nano Hydroxyapatite Toothpaste — it's SLS-free, fluoride-free, uses nano-hydroxyapatite for remineralization, and has a clean ingredient list without artificial colors or sweeteners. You can find it in our Self-Care recommendations.

The bottom line: your mouth is one of the most absorbent parts of your body. Whatever goes in there twice a day, 365 days a year, adds up. Read the tube.