| in preventing tooth decay | 23 | purpose |
| very | 14 | degree |
| in the correct concentration | 11 | location |
| fluoride → be → effective | 119 |
| fluoride → be → most effective | 22 |
| fluoride → be → the most effective agent | 11 |
| fluoride → be shown to be → effective | 4 |
| fluoride → proven to be → effective | 3 |
| negative | neutral | positive |
| 0.089 | 0.341 | 0.570 |
| Raw frequency | 159 |
| Normalized frequency | 0.795 |
| Modifier score | 0.500 |
| Perplexity | 33.030 |