Hydroxyapatite is a calcium-phosphate mineral in the same family as the mineral in tooth enamel, which is why it shows up in fluoride-free toothpaste. “Is it safe?” is really three questions: which particle specification, used how, by whom.
One+ lists 10% nano + micro hydroxyapatite among 16 disclosed ingredients, with a brush-and-spit direction. Klyyr does not claim a blanket safety clearance for every hydroxyapatite material—and no toothpaste should be described as safe to swallow.
Hydroxyapatite is a calcium phosphate and has a long history in dental and bone-contact materials. That background is relevant, but safety conclusions are still made for a defined material, concentration, and use—brushing and spitting—rather than for the mineral in the abstract.
The 2025 European SCCS opinion concluded on a specified uncoated, rod-shaped nano-HAp within stated size limits. It is not a verdict on every nano material, and it is not a Klyyr-specific clearance.
Anyone with a known sensitivity to toothpaste ingredients, a high cavity risk, or a dentist-prescribed fluoride routine. Children should use supervised, age-appropriate amounts and spit.
European Commission SCCS opinion on nano-hydroxyapatite (2025)
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10% nano + micro hydroxyapatite, 0 ppm fluoride, no SLS, and the complete 16-ingredient label published.
Toothpaste is for brushing, not swallowing. Klyyr’s direction for One+ is to brush and spit, and we do not describe any toothpaste as safe if swallowed. Supervise children so they use a small amount and spit.
No blanket ban applies to every hydroxyapatite. The 2025 SCCS opinion set conditions for one specified nano-HAp material—shape, coating, and size limits. Read that opinion as a specification-level document, not a statement about all toothpaste.
With supervision: a rice-grain amount under age 3 and a pea-sized amount for ages 3–6, then spit. One+ is an adult mint paste. Ask the child’s dentist before replacing a fluoride routine.
Any toothpaste can irritate a sensitive mouth. The ADA notes that flavors, some surfactants, and citrates—including zinc citrate, which One+ contains—are among reported contact irritants. Review the full list and stop if irritation appears.
No. Klyyr publishes the formula, directions, and cited research on other formulas. Those are not a clinical safety trial of One+, and we avoid wording that suggests otherwise.
