Your observations are perfectly correct. Miracle-Mineral-Supplement causes dental erosion. Several dentists have confirmed this, accusing me of tooth-grinding (bruxism) which I absolutely do not. Bicarb does not erode teeth, nor does 3% peroxide.
Don't believe what everything old man Humble says. He's a gold prospector, not a doctor or a dentist, even a naturopathic one. He's a one-trick Miracle-Mineral-Supplement pony. Miracle-Mineral-Supplement will do nothing for teeth or fungal infections! For other applications, use at your own risk.