Item — HN Reader

How could that be the case? Tap water is nowhere close to mineral saturation. It should make an astronomically small difference. If anything, it could be less corrosive due to the higher resistance.

I do see a possibility for it to be slightly more corrosive in pipes under specific circumstances, due to the lack of anything forming a passivating layer on the long run. But for teeth I have a hard time believing this.

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Are you kidding me?! Tap water has to go through dirty city pipes. Of course it's saturated with minerals. Not only that but Fluorine or Chlorine or whatever halogen they choose to kill the bacteria and protozoans with.

What I meant with saturation is the state when no more minerals can be absorbed.

Dissolution is based on concentration of existing solute. This isn't a binary effect of complete saturation like you suggest. Pure water has enough diffusion pressure to cause significantly more dissolution of a tooth's mineral lining than hard water. Diffusion pressure of pure distilled water is 1236 atm.

See DPD: https://en.m.wikipedia.org/wiki/Suction_pressure

Quote on quote: "If some solute is dissolved in water its diffusion pressure decreases. The difference between diffusion pressure of pure water and solution is called diffusion pressure deficit (DPD)."