We eat a lot of processed sugar, carbonated drinks, acidic products etc, which we aren’t evolved to deal with. Our diet is very artificial and tooth unfriendly.
It isn’t just the bacteria which cause a problem. It is acids in our food.
And our mouths are warm and moist. Bacteria can happily reproduce in there, and we naturally have a whole biome of bacteria living in our mouths and guts, some of them quite friendly and good for us!
So even if you kill all the existing bacteria with an antibiotic, then you will end up with problems with your gut, and new ones will quickly grow and recolonise the space, and they may not be quite as friendly as the old ones.
You have it in your own power to change your diet and also to regularly brush your teeth if you want to avoid tooth decay.
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