Answer:
When I type I tap these on the keys
Break it and it gets better, immediately set and harder to break again.
Consuming food would be pretty tough without these chompers
You can't keep this until you have given it. What is it?
Big as a saucepan, deep as a cup, Even a river can't fill it up. What is it
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?