Tooth staining Unlike clothing or hairstyles, body modifications are changes made to the body itself that are of a more permanent nature. Among the Chamorro people, the most remarkable examples of these kinds of modifications were tooth etching and staining. The Spanish missionaries described women as going to great lengths to stain their teeth as a sign of beauty. While betel nut chewing itself will stain teeth, the Chamorros did it purposefully, especially on the tooth's visible surface. This purposeful staining was achieved by applying other substances, in a process mentioned by the missionary, Father Peter Coomans.

https://guam.stripes.com/travel/digging-guams-history-ancient-chamorro-body-modification

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