WHO guidelines for 1.5mg/L fluoride

web.archive.org/web/20110707103002/http://…/en/#%….

Upper limit of 10mg/day

www.eatforhealth.gov.au/…/fluoride-updated-2017

Basic bath: only considering water intake, consuming 6-7 liters in a day (regular occurance working in Australia) puts you over the upper limit withoun considering major sources like diet, tea and dental products and treatments.