Answer:
Consuming food would be pretty tough without these chompers
This is a dead giveaway
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
What can touch someone once and last them a lifetime?
Blue lives in the blue house, Mr. Pink lives in the pink house, and Mr. Brown lives in the brown house. Who lives in the white house?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?