Calculus 2

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Across
  1. 2. Hardended plaque
  2. 7. Oxygen is present
  3. 9. Shapeless
  4. 11. Anti- calculus police
Down
  1. 1. Shield to protect the body from diseases
  2. 3. Mineral found in rocks to help teeth
  3. 4. Oxygen is absent
  4. 5. soaked with solution
  5. 6. Lacks cells
  6. 8. Nest for growth
  7. 10. Support and surrounds