Fluoride shortage has become acute in Canada.
D002170:Canada; D005457:Fluoridation; D005459:Fluorides / Q000008:administration & dosage / Q000600:supply & distribution; D012824:Silicic Acid; D012825:Silicon / Q000008:administration & dosage / Q000600:supply & distribution
D012824:Silicic Acid; C035291:hexafluorosilicic acid; D005459:Fluorides; D012825:Silicon