How good is your dental knowledge?

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Across
  1. 1. An adjunct to toothbrushing; It should not replace toothbrushing
  2. 3. Hardness of toothbrush you should use to protect your teeth from abrasion
  3. 7. One of the significant risk factors for oral cancer
  4. 8. A sign of gum disease
  5. 9. The cause of dental erosion or chemical loss of tooth structure
Down
  1. 2. Number of times you should brush your teeth in a day
  2. 4. An important oral hygiene practice
  3. 5. A common cause of early childhood caries, especially when consumed at night
  4. 6. The age you can start bringing your child to the dentist
  5. 7. Food you should avoid to prevent dental cavities