What does it mean when dentist says numbers?

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Tags

1. #between
2. #tooth
3. #indicates
4. #measure
5. #millimeters
6. #larger
7. #means
8. #tartar
9. #issues
10. #buildup
11. #number
12. #distance
13. #mouth
14. #smaller
15. #plaque
16. #dentists
17. #healthy
18. #patient