Link – sign up and get 5 friends to sign up to get a Free Boka Toothbrush. 10 Friends for Boka Brush and Floss. 25 Friends for a Boka Brush, Floss, and Mint Toothpaste, and 50 friends for 2 Boka Brushes, Flosses, and Toothpastes. Feel free to share your links in the comments.