55
Eating soap rule
(lemmy.nz)
Antacids are the oldest effective medications for heartburn. Chalk (calcium carbonate) has been chewed for centuries to provide some relief and is still popular.
https://iffgd.org/manage-your-health/diet-and-treatments/antacids/
Yes. This is why sugar rots your teeth https://en.wikipedia.org/wiki/Tooth_decay