en ● Health Education نامه به سردبیر Letter to Editor <div style="text-align: justify;">Fluoride is currently accessible in various forms, including water, toothpaste, mouth rinses, and professional fluoride therapy at dental clinics. A body of data supports the use of systemic and topical fluoride from various sources to prevent dental caries. Fluoride ions are absorbed by the enamel before tooth eruption and produce fluorohydroxyapatite, which is more resistant to acid attack than hydroxyapatite crystals [1]. Fluoride ions also aid in the early caries lesion remineralization process. As a result of the two mechanisms outlined above, fluoride strengthens enamel teeth against organic acids and dental caries.<br> &nbsp;</div> Drinking water fluoridation, Fluoride, Instagram, Tooth 237 240 http://jrh.gmu.ac.ir/browse.php?a_code=A-10-2122-1&slc_lang=en&sid=1 Saber Babazadeh BabazadehS@mums.ac.ir 1 100319475328460028536 No Department of Oral Health and Community Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Taraneh Movahhed MovahhedT@mums.ac.ir 2 100319475328460028537 No Department of Pediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Fatemeh Esmaeilzadeh esmaeilzadehf991@mums.ac.ir 3 100319475328460028538 Yes Department of Pediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.