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Sample demographics
| Plaque | Modern calculus | Historic calculus | |
|---|---|---|---|
| Source | HMP | This study | This study |
| N | 20 | 10 | 43 |
| Periodontal disease* | |||
| Yes | 0 | 6 | 18 |
| No | 20 | 4 | 25 |
| Caries* | |||
| Yes | 0 | 10 | 8 |
| No | 20 | 0 | 35 |
*On the tooth/teeth sampled. Detailed sample metadata is presented in Additional file 2: Table S1
