Teeth and mouth evolution in a species that only drinks fluids?

I'm thinking of making a species that evolved in a planet that has a type of algae that secretes a nutrient rich sludge that the species only has to drink to survive. I know that this would make their digestive tract and internal organs vastly different than a humans, but what about how their mouths are constructed? I imagine that they might have a trunk instead of teeth and lips. Does anyone else have some ideas on how the mouth design would be?

(I'm also curious about if this would make them no longer have a nose. I don't know why it would, but I don't really know the evolutionary reason we have noses. So I have no idea in this matter.)

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Teeth and mouth evolution in a species that only drinks fluids?

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