"Ποια οδοντόπαστα;"

Translation: Which toothpaste?

[pantelis]

What is the difference between this and οδοντόκρεμα ?

[troll1995]

No difference at all. Οδοντόκρεμα is somewhat used more, though.

[Wan525227]

Toothpaste is what it is in English, not toothcream. But basically both are referring to the same product.