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Science

Immune Cells May Play a Role In Causing Cavities (newatlas.com) 77

Researchers at the University of Toronto have found that cavities may be collateral damage from an overzealous immune system. New Atlas reports: Traditionally, bacteria have taken most of the blame for cavities and tooth decay. The bugs cling to your teeth as plaque and produce acid as waste, which dissolves tooth enamel, dentin and even filling material. But the new study suggests the story is more complicated than that. Oral immune cells called neutrophils are dispatched by the body in response to invading bacteria -- but the researchers found that they might be a little careless in the battle.

On their own, neutrophils can't damage teeth but the problems arise after acids from bacteria demineralize them. Once weakened, enzymes released by the neutrophils could wreak havoc on other tooth substances. Damage was found to appear in a matter of hours, and worse still, it also seems to apply to tooth-colored fillings, which may explain why they tend to fail within five to seven years. The silver lining of the discovery is that it could lead to new types of treatment, or new standards for testing materials that are to be used in fillings.
The research was published in the journal Acta Biomateralia.
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Immune Cells May Play a Role In Causing Cavities

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  • by Futurepower(R) ( 558542 ) on Monday April 15, 2019 @09:03PM (#58442584) Homepage
    "Immune Cells May Play a Role In Causing Cavities"

    The key word is "may".

    The issues are not being fully explored.
  • A Related Story (Score:5, Interesting)

    by TechyImmigrant ( 175943 ) on Monday April 15, 2019 @09:39PM (#58442650) Homepage Journal

    I follow a carnivore diet, on which I dropped 70 pounds and halted my internal inflammation. So no sugar or plants.

    6 months in, I went to the dentist.
    The hygenist was doing her thing. The dentist walked in and asked "So how is he doing with his flossing?"
    The hygenist said "Perfectly - he'd been keep it clean between his teeth, there is zero build up and his gums aren't inflamed any more".
    But I had not brushed or flossed once.

    So plants and sugar that promote inflammation also contributes to the tooth decay. This is n=1 supportive evidence of that finding.

    • Re:A Related Story (Score:5, Insightful)

      by mishehu ( 712452 ) on Monday April 15, 2019 @11:12PM (#58442846)
      Repeat after me: "The plural of anecdote is not data." And certainly the singular of anecdote is not data either
      • A datum is the singular of data. This is one datum. The experience of many other people on a carnivore or no-sugar keto diet is an improvement in dental heath.

      • It's not just an anecdote, there's also a very simple mechanism that explains the effects.

        Bacteria love sugars more than anything else.

    • by swell ( 195815 )

      I can affirm that. I'm on a keto diet- ~18 carbohydrates total daily. That means no excess protein (which can be converted to carbs) and lots of fat. EVERY vital sign is optimized and my teeth are excellent. The dental industry push to brush & floss daily is superstition at best, subterfuge at worst. God did not give us defective teeth that need such treatment. We made them defective with our massive intake of carbohydrates.

      And yes, those carbs contribute to inflammation, obesity and brain damage among

      • Dentistry pushes what is necessary to accommodate a diet based on grain. Civilization's diet is based on grain because it is the cheapest and easiest way to avoid starving, you can grow a lot of it, and agrarian societies eventually push out hunter-gatherers. Dogs compared to wolves are also more able to accommodate grain in their diet. Inflammation related to eating grain is kind of like lactose intolerance... the genes for being able to eat grain and retain lactase are relatively new and haven't made f
    • by Anonymous Coward

      Crohn's here with pouchitis. 2 month keto diet 85% fixed my symptoms. I'm underestimating if any.

      Maybe the bacterial makeup changed. Which changed the immune response. Certainly worthy of more research, not dismissal.

      • See this: https://www.youtube.com/watch?... [youtube.com]

        It shows an interventional research study where removing plants has been shown to heal a permeable, inflamed gut.

        I know a few people with Chron's who improved or fixed their symptoms on a keto and then a carnivore diet. There are also a lot of people who were suffering psychological disorders, who improved or eliminated them on a carnivore diet.

    • Am I reading this right? You literally didn't brush your teeth for 6 months?
    • by AmiMoJo ( 196126 )

      You had not brushed or flossed your teeth, but there was no plaque build up? Perhaps you meant something else.

      When you say you avoided all sugar and plants, does that include in beverages? Because aside from water there isn't much you can drink that doesn't contain some plant derivative in it.

      • >You had not brushed or flossed your teeth, but there was no plaque build up?
        Correct.

        >Perhaps you meant something else.
        No plaque, bad breath, cavity formation or gum disease (I had a history of all four beforehand).

        >When you say you avoided all sugar and plants, does that include in beverages?
        I drink coffee and water. Coffee is hardly carnivore, but I'm not following anyone's rule book.

        >Because aside from water there isn't much you can drink that doesn't contain some plant derivative in it.
        Dairy

        • by AmiMoJo ( 196126 )

          Interesting. I'm surprised your teeth didn't stain very quickly though.

          • They didn't. I kept an eye on it.I always had the option to go back to brushing and dental hygenists.

            I do brush occasionally - usually down to when I have a crappy taste in my mouth, from an illness or jetlag or the occasional accidental sugar intake (it's hidden in many things - jerky is a minefield). I maintain a Michelin exception - If the restaurant has a one or more Michelin star, eat the food. I need to brush after that. That's once or twice a year.

    • My brother-in-law went on a high protein no carb diet when he was in the military. It couldn't have been healthy he was eating a plate full of bacon and sausage links for breakfast, but he did drop a lot of weight fast. I have no idea if did anything for his teeth but I imagine his cholesterol was through the roof.

      • > It couldn't have been healthy ...
        > but he did drop a lot of weight

        This is the cognitive dissonance of people who think fat is bad and carbs or plants are necessary. It isn't, they aren't.

        The world is full of doctors who say "Wow your health has improved on your wacky diet - but I'm concerned the diet is unhealthy". A lack of mental clarity if ever there was one.

    • Humans are omnivores as far back as anyone can detect, and not brushing or flossing at all is not a strategy for dental health.

      An anecdote in a blog comment notwithstanding.

      • >Humans are omnivores as far back as anyone can detect,

        Untrue - it's been debated a lot, but the recent nitrogen isotope research shows forebears were strictly carnivore.
        Adapting to tolerate plants certainly happened and was a good survival trait when you run out of big animals to eat.

        Check out the research of Miki Ben Dor. He pulled together a lot of the data.

        Paper here: https://www.pnas.org/content/1... [pnas.org]
        Discussion here: https://twitter.com/KetoCarniv... [twitter.com]

        Interesting stuff.

  • by Livius ( 318358 ) on Monday April 15, 2019 @10:20PM (#58442742)

    I know we've seen worse in science reporting, but 'overzealous' is not a helpful term to use in describing the immune system.

    They still saying acid produced by bacteria is the underlying cause, so nothing new there, *but* they've identified a mismatch between the immune system's strategy for responding to the bacteria and the altered chemical environment created by said bacteria, and that insight potentially could prove very valuable in determining improved treatments.

    • Overzealous immune response is the cause of pathology in many instances: host-graft disease, auto-immune disease, 1918 flu, hantavirus, allergy, etc. As with something like chemo, it is just that what is bad for you is hopefully worse for the pathogen and your body packs things up afterward.
  • Well, I'm 31 and have yet to get a cavity.

    I don't know how common or not that is. or what to make of that.

    I guess I just take care of brushing and flossing regularly, no secret.

  • If it's caused by the immune system is it still a cavity, or is it tooth [cornell.edu] resorption? [wikipedia.org]

Somebody ought to cross ball point pens with coat hangers so that the pens will multiply instead of disappear.

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