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Healthy teeth have a lot to do with genetics too. I’m a once/day brushed (with a powered brush) and never flush unless something’s stuck in my teeth and I don’t get cavities or have other teeth and mouth problems. My wife brushes twice a day, flosses, and uses mouth wash, and has had 12 root canals, and has cavities 25% of the time she gets her cleanings done.
There are two other main differences between us. She loves sugar and I’d prefer anything salty. I’m sure this isn’t helping her and is helping me since sugar is our mouths’ enemy.
The sugar is honestly probably the biggest factor here. Plaque is just bacteria poop, and giving them a bunch of sugar is basically speedrunning their growth and telling them to produce as much poop as they possibly can.
What I left out is that I don’t know anyone in my family with teeth issues and she definitely does. Her mother had garbage teeth as does her father. But yeah, sugar is bad for you period.