Result of forgetting to pack a toothbrush for a Doha vacation?

The answer to this crossword question is QATARTARTAR. This is a play on words, as it combines the name of the city Doha, which is the capital of Qatar, with the term tartar, which is a hard, yellowish deposit that can form on teeth when they are not brushed regularly. The result of forgetting to pack a toothbrush for a Doha vacation would be the buildup of tartar on one’s teeth, hence the punny answer QATARTARTAR.