S3 Daily Sensitive combines three active ingredients to calm, strengthen and protect. Here is an honest, side by side look at how it compares with Sensodyne Repair & Protect, based on what each brand states about its own formula.
Key points.
- S3 Daily Sensitive is formulated with three active ingredients: potassium nitrate (5%), nano hydroxyapatite (10%) and biomimetic hydroxyapatite (5%).
- Sensodyne Repair & Protect is built around NovaMin (calcium sodium phosphosilicate) with sodium fluoride.
- Both contain fluoride and both are free from SLS.
- S3 states its formula is vegan and cruelty free.
- This page compares ingredients and stated actions only, not clinical performance.
Why the cause matters.
Tooth sensitivity is often linked to two things at once. The nerve inside the tooth reacts to triggers like cold, heat or sweetness, and the protective layer that normally shields the nerve becomes thin or worn, leaving the dentine exposed. A formula that works on more than one of these can address more of what is going on inside the tooth.
This is the thinking behind S3. Rather than a single approach, it brings together three active ingredients, each chosen for a different part of the picture.
The S3 approach: calm, strengthen, protect.
S3 also contains fluoride (sodium monofluorophosphate) for everyday cavity protection. Sensodyne Repair & Protect is built around NovaMin, which Sensodyne describes as building “a repairing layer over the vulnerable areas of your teeth”, together with sodium fluoride.2
Behind the formula.
S3 was created by a team that includes formulators who previously worked on Sensodyne and Aquafresh, and it is recommended by UK dentists Dr Victoria Sampson and Dr Surina Sehgal. The formula has been independently tested at the University of Reading.
It calms the pain, while also helping to rebuild the enamel. — Dr Victoria Sampson, BDS MFDS
Side by side.
| Feature | S3 Daily Sensitive | Sensodyne Repair & Protect |
|---|---|---|
| Active ingredientsas named by each brand | Potassium nitrate 5%; nano hydroxyapatite 10%; biomimetic hydroxyapatite 5% | NovaMin (calcium sodium phosphosilicate); sodium fluoride |
| Stated action | Calms the nerve · helps seal dentine · lays a protective mineral layer | “Builds a repairing layer over the vulnerable areas of your teeth” |
| Fluoride source | Sodium monofluorophosphate | Sodium fluoride |
| Contains SLS? | No | No |
| Vegan and cruelty free | Yes (stated by S3) | Not stated by Sensodyne |
| Format | Toothpaste (tube) | Toothpaste (tube) |
| Price | £19.99 | Varies by retailer |
| Independent testing referenced | University of Reading | “Clinically proven” (per Sensodyne) |
Taken from each brand’s published ingredients and product information.12 Prices and formulations may change, so always check the pack.
Hydroxyapatite and NovaMin: what the science says about the ingredient types.
Both hydroxyapatite and NovaMin (calcium sodium phosphosilicate) are studied for dentine hypersensitivity. Hydroxyapatite is the mineral that tooth enamel is naturally made from. At nano scale it is studied for its ability to occlude, or seal, the open dentinal tubules that transmit sensitivity. Potassium nitrate works by a different route, with potassium ions studied for calming the nerve signal inside the tooth. NovaMin releases calcium and phosphate ions that form a mineral layer on the tooth surface.
S3 combines a nerve calming active with two forms of hydroxyapatite. Sensodyne Repair & Protect uses NovaMin with fluoride.
Frequently asked questions.
Is S3 an alternative to Sensodyne Repair & Protect?
Both are toothpastes formulated for sensitive teeth and both contain fluoride. They use different active ingredients. S3 combines potassium nitrate with two forms of hydroxyapatite, while Sensodyne Repair & Protect is built around NovaMin. Which one suits you is a personal choice.
What is the main ingredient difference?
S3 Daily Sensitive contains potassium nitrate (5%), nano hydroxyapatite (10%) and biomimetic hydroxyapatite (5%). Sensodyne Repair & Protect contains NovaMin (calcium sodium phosphosilicate) and sodium fluoride.
Does S3 contain fluoride?
Yes. S3 Daily Sensitive contains sodium monofluorophosphate. Sensodyne Repair & Protect contains sodium fluoride.
Are they free from SLS?
Yes. Neither product lists sodium lauryl sulfate (SLS) in its ingredients.
Is S3 toothpaste vegan?
S3 states that its formulations are vegan and cruelty free. Sensodyne does not state this for Repair & Protect.
Can I switch from Sensodyne to S3?
Both are everyday fluoride toothpastes for sensitive teeth and are used in the same way, brushing twice daily. As with any change to your routine, if you have ongoing dental pain, see your dentist.
Three active ingredients in one daily toothpaste. Vegan, cruelty free and free from SLS, with a 30 day money back guarantee. Try S3 Daily Sensitive.
This page compares published ingredient information. It is not a clinical comparison. For persistent pain, see your dentist.
