10% is the concentration examined in clinical studies on enamel remineralization. It is the strength the research consistently points to, and it is exactly what's in every tube of Nudge. And to be precise, ours means 10.0 grams of actual hydroxyapatite per 100 grams of finished paste, not 10% of a slurry or a premix. Worth asking any brand that question.

Rod-shaped nano-hydroxyapatite mirrors the crystalline structure of natural tooth enamel more closely than spherical alternatives. That lets it integrate more effectively with the tooth surface as you brush. Ours is rod-shaped, uncoated, and not surface modified, matching the particle specification the EU's Scientific Committee on Consumer Safety assessed in SCCS/1677/25.

Fluoride forms a protective layer on top of the tooth. Nano-hydroxyapatite works differently. Because it is the same mineral your enamel is already made of, research examines how it integrates with the tooth structure, helping fill microscopic gaps and support the enamel itself. It has been trusted in professional dental care in Japan for decades.

Families love it, and the fruit flavors make brushing easy. Use a pea-sized amount with supervised brushing and encourage spitting. For children under 2, check with your dental professional first.

SLS is the foaming agent in many conventional toothpastes, and it can irritate gums for some people. Nudge uses sodium cocoyl glutamate instead, a gentle coconut-derived cleanser that lifts debris and leaves your mouth clean without the harsh foam.

Natural Mint if you want the familiar one done properly. Orange and Watermelon are the ones kids ask for by name. Cinnamon & Clove is the one people get quietly obsessed with. All four are the same formula underneath, so pick on taste alone.

Right here, in full. Tested by an accredited, independent US third-party laboratory. Report ID VEU3AP, sample collected March 2026, method AOAC 2015.01. Results apply to the sample tested.

Because almost nobody does. Most brands in this category will tell you their product is clean and leave it there. We'd rather commission an independent US lab, put the whole document on the page, and let you read it yourself. It's the difference between a claim and a document.

Everything. Try Nudge for 30 days, and if it isn't the best toothpaste you've used, email us and we'll refund you in full. No return required, no argument. Buying it is the easy part, and there is no risk in trying it.