"OUR SILK REFILLS have been tested for purity in two independent Labs in North America. QUEBEC, AND KENTUCY USA Our lab results, PROVED A100% PURE SILK. result Each refill spool, contains 40 Metres of Floss or 86 usages of 18.5"". Approximately 3 months with regular use.COST OF USE PER DAY AVERAGES 11CENTS. (CANADIAN )"

Dosage

At least - Once per day, for optimal oral care.