COFFEE my main source of nutrition!

I love my Keurig machine and I love that there are so many flavors available. I used to drink mine with little sugar but since someone has gotten me paranoid about black coffee staining my teeth I now add cream. I sometimes will add hazelnut flavored liquid sugar or coconut. But hazelnut is my favorite.
I don't like my coffee overly sweet and when my hubby sips my coffee (he's not a coffee drinker) he says it's so bitter.
Do you all drink light, medium, or dark roast? I like mine medium and dark.

We have in Hawaii a Lion's brand coffee that is 100% Kona coffee and it's the only coffee that my dad will drink. He lives in Texas and I have to ship him tons of coffee several times a year. LOL