Benarkah kaum wanita Suku Rejang dahulu punya kebiasaan membuat gigi mereka hitam?

Page 95, is it artikel true? where the source?

Kalimat itu menyatakan, bahwa wanita Rejang jaman dahulu punya kebiasaan membuat gigi mereka hitam pekat.

The natural genesis: or second part of A book of the beginnings - Page 95

by Gerald Massey - 1883

The Rejang women of Sumatra are in the habit of making their teeth jet black,
but some of them, particularly those of the Lampong country, file them right ...

Apakah bener statemen di buku tersebut? ada orang Rejang yang bisa memberikan informasi lebih lanjut?

http://books.google.com/books?id=ph1q4ccOOtIC&pg=PA95&dq=rejang+teeth&sig=7yX20GP22vK_bNn9-DxY1dYYIuA#PPA95,M1