Where does “ohaguro” come from?

ohaguro (English) comes from Japanese お歯黒, from Japanese 御, from Middle Chinese 御.

ohaguro (English): The Japanese custom of blackening the teeth with a solution of iron filings and vinegar, especially popular between the Heian and Edo periods, from the 10th century until the late 19th century

Definitions

The Japanese custom of blackening the teeth with a solution of iron filings and vinegar, especially popular between the Heian and Edo periods, from the 10th century until the late 19th century

Ancestry of “ohaguro”, step by step

Step	Language	Word	Meaning
1	Japanese	お歯黒	ohaguro
2	Japanese	御	"indicates that the is honorific"; often used to...
3	Middle Chinese	御	—

Every word from Middle Chinese 御 →Every word from Japanese 御 →Every word from Japanese お歯黒 →