tooth stains and discoloration

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Across
  1. 3. social habit that might cause staining
  2. 5. occurs when ingesting too much FL2
  3. 7. antibiotic
  4. 11. found in OTC and RX products
  5. 12. not endo
  6. 13. primarily aesthetic and not harmful
  7. 14. primarily consumed in asia
  8. 15. external or internal or laser
  9. 16. stain as a result of oral uncleanliness
  10. 17. continuous fine line about 1mm wide
  11. 19. stain that is difficult to remove
  12. 20. dull, yellowish discoloration of biofilm
Down
  1. 1. pulp died due to trauma
  2. 2. cannot be removed by polishing or
  3. 4. permanently embedded in tooth
  4. 6. 1 of 2 classifications of stain by location
  5. 8. rinse with antimicrobial benefits
  6. 9. caused by genetics, drugs, trauma
  7. 10. deficiency in enamel
  8. 12. may be removed by polishing or scaling
  9. 18. light brown to leathery brown