As soon as two teeth touch, for all spaces, even the narrowest ones.
Dental tape Vitis with fluoride and mint 50m
Waterdrop TK-AD-FS Alkaline Gravity Water Filter System, Increase PH | Reduces Fluoride and Chlorine, with 4 Filters and Metal Spigot for Home, Campin
Waterdrop WFD-02W 35-Cup Water Filter Dispenser, Fluoride Reduction, White | Reduces 90%+ Fluoride, 150-Gallon Long-Life, Large Capacity, Reduces Chlo
Waterdrop WFD-02L 35-Cup Water Filter Dispenser, Fluoride Reduction, Black | Reduces 90%+ Fluoride, 150-Gallon Long-Life, Large Capacity, Reduces Chlo
Lacer Extra Soft Floss with Fluoride and Triclosan 50m 1 unit
Kin Dental Floss with Fluoride and Mint 50ml Unisex
