| Clue | Source | Date |
|---|---|---|
| Device that protects teeth and gums | LA Times Daily | 28 May 2024 |
| Oral appliance | Newsday | 03 Sep 2022 |
| Sentry watching over a river's end? | Wall Street Journal | 12 Mar 2018 |
| Defender of a river area? | Wall Street Journal | 21 Nov 2016 |
| Teeth-and-gums protector | ||
| Protector in the ring | ||
| Protector in the ring |