[boppo1]

So... how bad is a black coffee I sip on for 30 min? Google says the PH is about 5. No

Also: it has definitely stained my teeth. Is there a way to remove the stains that doesn't weaken the enamel?

[_yb2s]

Adding milk to coffee will raise the pH to above 6.

[oilchange]

You can try drinking coffee through a straw.