Not all Sensodyne toothpastes are SLS-free. Many varieties in the lineup skip sodium lauryl sulfate, but several products, including the entire Sensodyne Repair and Protect line, still contain it. You need to check the ingredient list on the specific tube you’re buying.
Which Sensodyne Products Contain SLS
Sensodyne Repair and Protect is the most notable line that includes SLS. The Mint, Extra Fresh, and Whitening versions of Repair and Protect all list sodium lauryl sulfate as an inactive ingredient. This is true in the U.S. market, and formulations can vary by country, so a product that’s SLS-free in one region isn’t guaranteed to be SLS-free in another.
Sensodyne’s own website acknowledges the split directly: “Many Sensodyne toothpastes are formulated without SLS.” The word “many” is doing real work there. It’s not “all.”
Which Sensodyne Products Are SLS-Free
Sensodyne markets a dedicated SLS-free collection that includes Sensodyne Extra Whitening and Sensodyne Fresh Mint. The entire Pronamel sub-brand also appears to be formulated without SLS. Pronamel Daily Protection, Pronamel Mineral Boost, Pronamel Active Enamel Shield, and Pronamel Intensive Enamel Repair are all listed as SLS-free by an NHS hospital reference guide. A full ingredient breakdown of Pronamel Clinical Enamel Strength Deep Clean confirms no sodium lauryl sulfate in the formula.
Instead of SLS, these products use milder foaming agents. The most common replacement is cocamidopropyl betaine, a gentler surfactant derived from coconut oil. Some Sensodyne varieties pair it with sodium methyl cocoyl taurate, another coconut-derived cleanser. Together, these create enough foam to spread the toothpaste around your mouth without the irritation potential of SLS.
Why SLS Matters for Sensitive Mouths
SLS is a detergent. It’s the ingredient responsible for that thick lather when you brush. For most people it’s harmless, but it can irritate the soft tissue inside your mouth, particularly if you’re prone to canker sores. Researchers have found that people who switched to SLS-free toothpaste experienced fewer canker sores overall. A 2012 clinical trial with 90 participants found that those using SLS-free toothpaste reported their canker sores healed faster and caused less pain compared to periods when they used toothpaste containing SLS.
If you already have sensitive teeth or gums (which is presumably why you’re looking at Sensodyne in the first place), SLS can add another layer of irritation on top of existing discomfort. That’s the logic behind Sensodyne offering SLS-free options: reducing every possible source of irritation for people whose mouths are already reactive.
How to Check the Label
On the back of any toothpaste tube, look through the inactive ingredients list. Sodium lauryl sulfate is sometimes listed as sodium dodecyl sulfate or sodium laurel sulfate, though the most common spelling on U.S. packaging is “sodium lauryl sulfate.” It will appear in the inactive ingredients section, not the active ingredients (which typically list the fluoride compound or sensitivity treatment).
If you see cocamidopropyl betaine or sodium methyl cocoyl taurate listed as surfactants but no mention of sodium lauryl sulfate, the product is SLS-free. Some Sensodyne packaging also prints “SLS-free” on the front of the box, but not all SLS-free varieties advertise it prominently, so checking the full ingredient list is more reliable.
Keep in mind that formulations change over time and differ between countries. An NHS resource on SLS-free toothpastes puts it plainly: “Only the specific varietals noted are SLS free, so please check carefully when shopping.” The safest approach is to read the ingredient list on the actual tube every time you buy, rather than assuming a product you’ve used before hasn’t been reformulated.