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Mouthology via Amazon [amazon.com] has 4-Oz Mouthology 10% Nano Hydroxyapatite Fluoride-Free Toothpaste (Fresh Mint) on sale for $9.99 – $3.00 off when you ‘clip’ the coupon on product page – 20% off when you checkout via Subscribe & Save = $4.99. Shipping is free w/ Prime or on orders $35+.[LIST][*]Features:[LIST][*]10% nano-hydroxyapatite (n-HA) — calcium-based compound that mirrors 96% of natural tooth enamel composition