Actually, the study upon which this story is based is scientifically flawed and doesn't prove fluoridation cessation caused more tooth decay. Here's why: https://www.prnewswire.com/news-releases/juneau-fluoridation-study-more-hype-than-evidence-300780280.html
Besides, modern science shows that ingested fluoride, neither a nutrient nor essential for healthy teeth, is ineffective at reducing tooth decay and is harmful to health according to 4800 professionals http://fluorideAlert.org/researchers/professionals-statement/text
Tooth decay crises are occurring in all fluoridated cities, states and countries http://FluorideNews.Blogspot.com