Was impressed by the use of natural decay vs painted mural. (graffuturism.com)
This could than be dated by scientists by a using a radiometric technique to measure natural decay of uranium to thorium. (cage.uit.no)
If your dog has lost most of his teeth by natural decay processes (rather than through removal by your veterinarian during a dental visit), then it is quite likely that his remaining teeth are also quite rotten, and thus painful. (petsmagazine.com.sg)