Gouania lupuloides
Gouania lupuloides, known as chewstick or whiteroot, is a neotropical plant of the family Rhamnaceae. It is occasionally used as a teeth-cleaning implement. Description 
Gouania lupuloides ranges from Mexico in the north to the top of South America in the south, and to the West Indies in the west. Gouania lupuloides is plentiful around the edges of clearings but appears only occasionally in the forest canopy. G. lupuloides flowers from November to March, usually in the early dry season; the plant does not often flower in March and rarely flowers in the rainy season. G. lupuloides can fruit as early as January, and as late as May with a peak in March and April. Uses 
In Jamaican patois a vine is called a wis (wythie). To clean one's teeth with this plant one cuts off a portion of the vine, peels off the bark and chews the tip. The tip becomes fibrous and frothy. Chewstick tastes slightly bitter but not unpleasant. The plant is used to make a commercial toothpaste. Chewstick may also be used as an ingredient in Jamaican ginger beer. References

 MEDlCINAL PLANTS OF JAMAICA. PARTS 1 & 11. By G. F. Asprey, M.Sc., Ph.D. (B'ham. ), Professor of Botany, U.C.W.l. and Phyllis Thornton, B.Sc. (Liverpool), Botanist Vomiting Sickness Survey. Attached to Botany Department, U.C.W.l. lupuloides
Flora of the Caribbean
Flora of Central America
Flora of Colombia
Flora of Ecuador
Flora of Mexico
Flora of Peru
Flora of Venezuela
Flora without expected TNC conservation status