Tooth pastes are rich in fluorides, which end in water sinks and then into waste water pipes, and if a leakage took place, it can flow into groundwater layers.
Hello! Perhaps the following two articles might be of some interest to you:
Monitoring of Fluoride Concentration In Ground Water of Small Tea Gardens in Sonitpur District, Assam, India: Correlation with Physico-Chemical Parameters (DUTTA et al., 2010)
http://sphinxsai.com/s_v2_n2/CT_V.2No.2/ChemTech_Vol_2No.2_pdf/CT=72%20%281199-1208%29.pdf
Chloride/Bromide and Chloride/Fluoride Ratios of Domestic Sewage Effluents and Associated Contaminated Ground Water (VENGOSH and PANKRATOV, 1998)
https://info.ngwa.org/GWOL/pdf/982564300.PDF
Yes, it can as long as the Fluoride concentration in the effluent is considerably larger than the naturally occurring Fluoride. Naturally occurring Fluoride can be high in some groundwater from dissolution of some minerals. Also, you might consider other good tracers present in effluent like nitrate or possibly boron.
Hi Mohammad Al Farajat; Yes it can be but only tooth pastes are not only sources for polluting sewage waters. In Asian countries fluoride in tooth paste is not very common yet. As in many parts of our country India fluoride i drinking ground waters are already high and creating fluorosis. But of course it can be. Regards
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