maintainer

noun3

1. •
   Someone who keeps or upholds something; a steward.

   • He become the maintainer of the software project.
2. •
   A person who does maintenance work.

   • “In somm trouble. Got off trail to go to br. Now lost. Can u call AMC to c if a trail maintainer can help me. Somewhere north of woods road. Xox,” she wrote. — 2016
3. •
   A device used to keep teeth in a given position.