| over time | 6 | temporal |
| to remove a professional cleaning | 4 | purpose |
| often | 3 | degree |
| tartar → be → harder | 6 |
| tartar → be → difficult | 6 |
| tartar → become → more difficult | 3 |
| tartar → become → hard | 3 |
| negative | neutral | positive |
| 0.566 | 0.357 | 0.077 |
| Raw frequency | 18 |
| Normalized frequency | 0.444 |
| Modifier score | 0.600 |
| Perplexity | 307.654 |