Answer:
You do not want me when you donβt have me, but when you have me you donβt want to lose me.
I have a few points but we're not competing. I'll help you win when you're eating.
David's father has three sons: Snap Crackle and ?
Bright as diamonds, loud as thunder, never still, a thing of wonder. What am I?
You use me between your head and your toes the more I work the thinner I grow.
Written on with words of white, Has the color of the night, Is the teacher's best delight, And a student's daily fright