PearlSmile Niacinamide Hydroxyapatite Whitening Toothpaste combines 10% nano-hydroxyapatite (nHAp) for enamel remineralization with 5% niacinamide for gentle whitening. This fluoride-free formula is enamel- and gum-friendly, free from peroxide, SLS, parabens, and harsh abrasives, and is suitable for sensitive teeth. Supports enamel defense and mineral balance, with travel-ready 4.2 oz packaging. Noticeable whitening in 7–14 days with consistent use. A mild, temporary bitterness may occur at first due to niacinamide, fading quickly for a clean, refreshed mouth.