How do I know if my knife needs sharpening?

Related questions

1. How do you sharpen knives with a knife sharpener?
2. What oil is best for sharpening stone?
3. Do electric knife sharpeners ruin knives?
4. What is the best stone for sharpening chisels?
5. Does stropping sharpen a razor?
6. Does cutting plastic dull knives?
7. Can you use a knife sharpener on serrated knives?
8. What angle do you strop a knife at?
9. Does cutting paper make scissors dull?
10. Can I use sandpaper to sharpen a knife?

Tags

1. #sharp
2. #while
3. #through
4. #motion
5. #slicing
6. #recommend
7. #paper
8. #caution
9. #method
10. #shave
11. #knife
12. #useful
13. #pressing
14. #using
15. #razor
16. #without
17. #cleanly
18. #another