Plants are vulnerable to fluoride accumulation in soil, and their growth and development can be negatively affected, even with low fluoride content in the soil.
Basic bath: only considering water intake, consuming 6-7 liters in a day (regular occurance working in Australia) puts you over the upper limit without considering major sources like diet, tea and dental products and treatments.
Ideally both.
https://www.researchgate.net/publication/356603384_Bioaccumulation_of_Fluoride_in_Plants_and_Its_Microbially_Assisted_Remediation_A_Review_of_Biological_Processes_and_Technological_Performance
WHO guidelines for 1.5mg/L fluoride
https://web.archive.org/web/20110707103002/http://www.who.int/water_sanitation_health/publications/2011/dwq_guidelines/en/#%3A~%3Atext=This+fourth+edition+of+the+World+Health+Organization’s%2Cfor+water+safety+in+support+of+public+health.
Upper limit of 10mg/day (considered to be high by some bodies)
https://www.eatforhealth.gov.au/nutrient-reference-values/nutrients/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 without considering major sources like diet, tea and dental products and treatments.