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Joined 2 years ago
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Cake day: June 12th, 2023

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  • SuperIce@lemmy.worldtoScience Memes@mander.xyzbrains!
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    27 days ago

    Your timeline is incorrect. 15 years ago was 2009, when CFLs were most common. A 60W equivalent CFL was 13W and 100W equivalent was 23W. My house was still mostly incandescent bulbs with some CFLs for bulbs that had died and weren’t on a dimmer. Commercial LED bulbs intended for residential use only started being released in 2009-2010 with incentive from the US government.




  • SuperIce@lemmy.worldtoScience Memes@mander.xyzflouride
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    27 days ago

    A study in Canada was published in 2019 looking at the differences between 2 neighboring cities where on stopped fluoridating water in 2011. They saw that saw a significant increase in cavities in children in the city that stopped fluoridating vs the other. This is despite the fact the the city without fluoridation actually has somewhat higher adherence to brushing, flossing, and going to the dentist. No difference was seen yet in permanent teeth, but that’s because the study would need more time to see effects there.

    https://onlinelibrary.wiley.com/doi/full/10.1111/cdoe.12685

    Of course, we still should do more studies on fluoride neurotoxicity. Most studies look at levels of fluoride at 1.5mg/L or higher, which is more than double the recommended level by the US (0.7 mg/L). There is a hard limit in the US of 4mg/L, but the EPA strongly recommends a limit of 2mg/L. This only really matters for locations with very high levels of fluoride in the groundwater, and is thus quite rare. The EU’s limit is 1.5mg/L.


  • SuperIce@lemmy.worldtoScience Memes@mander.xyzflouride
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    27 days ago

    Fluoride in the water is beneficial in the pre-eruptive phase (when teeth are still growing). Fluoride ingestion increases tooth resistence to cavities if the ingestion happened while they were growing.

    This does mean that fluoride in water isn’t really useful after you have all your permanent teeth though.