What Toronto Says About Fluoride in Its Tap Water
Toronto's published fluoride target is 0.6 parts per million. Understand the local figure, the national guideline and what they mean for everyday dental care.
Toronto Public Health states that the city adjusts fluoride in its drinking water to a target of 0.6 parts per million. That is the local figure on the city's current dental-health page, checked October 20, 2026. If you have seen 0.7 elsewhere, you may be reading the national guideline rather than Toronto's operating target.[1]
Two figures with different jobs
Health Canada identifies 0.7 milligrams per litre as the optimal concentration for communities choosing to fluoridate. At these water concentrations, milligrams per litre and parts per million express the same quantity. A national recommendation and a city's published target should be labelled separately; one should not silently replace the other in a local answer.[2]
The city describes fluoridation as a measure to help prevent tooth decay and notes that its drinking water is regulated under Ontario's Safe Drinking Water Act. Toronto Water provides information about treatment and water-quality monitoring. For a current question about the municipal supply, those local pages are more useful than a social-media graphic with no location or date.[1][3]
Water and toothpaste have different uses
Fluoride can help protect tooth surfaces, but drinking tap water does not replace brushing with fluoride toothpaste. Health Canada discusses community water, toothpaste and professionally applied products as different ways fluoride is used in oral care. A dental recommendation should consider your circumstances rather than assume that one source makes the rest unnecessary.[2]
If you mainly drink bottled water, use a private well outside the city, or rely on a home treatment system, tell the dental team which supply you actually use. The Toronto target does not describe every bottle or every filter's output. For a filter question, check that model's documented performance instead of assuming all filters behave alike.
Make the everyday choice easy
For an ordinary workday, the practical issue may simply be having plain water within reach. Fill the bottle before leaving home and identify where you can refill it. If you are discussing extra fluoride with a dentist, bring the names of your toothpaste and rinses too. That gives the conversation a useful starting point without turning every glass of water into a calculation.