IANAD.
Those of y’all that aren’t brushing, aren’t getting cavities, and don’t have two-inch tooth fuzz stickin’ outcher mouth probably have some of the following factors in your favor…
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you generally don’t eat or drink much stuff that leaves plaque-making-bacteria-food in your mouth (sugary stuff)
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you generally don’t eat or drink much stuff that helps plaque-making bacteria start holes in your enamel (acidic stuff)
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if you do eat or drink sugar/acid, you usually follow it up with lots of water, or baking soda, or maybe cheddar cheese, or apples, or something else that washes off, scrapes off, or neutralizes the sugar/acid
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you have juicy saliva genes (saliva being one of the things that helps wash sugar/acid/bacteria off teeth)
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you have strong tooth enamel genes
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the actual shape of your teeth and the gaps between them have fewer than normal places for bacteria and bacteria food to hide (no kidding; I had what a dentist called “deep molar grooves,” so he spackled them for me - you could say they’re preventive fillings)
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you’re consuming a lot of something else that helps, like fluoridated water, or things sweetened with xylitol, or something that helps produce saliva or an anti-acidic mouth environment, or…
On the other hand, you can have dental hygene habits that get you a medal at your next cleaning, and still have evil breath. My husband was on an antidepressant for a while that gave him the nastiest outhouse stankbreath ever. Our theory is it changed his mouth chemistry somehow. As soon as he went off it, his breath went back to its normal clover-like sweetness.