| over time | 9 | temporal |
| due to food | 6 | cause |
| following a root canal treatment | 4 | temporal |
| tooth → can → darken | 37 |
| tooth → become → darkened | 21 |
| tooth → become → darken | 4 |
| tooth → darken in → first place | 3 |
| tooth → darken → dull | 3 |
| negative | neutral | positive |
| 0.486 | 0.457 | 0.057 |
| Raw frequency | 68 |
| Normalized frequency | 0.404 |
| Modifier score | 0.600 |
| Perplexity | 114.360 |