Question - What is Daw Tway?
Answer -The cited reference notes “Daw Tway is a digestive aid used in Thailand and Myanmar (Burma). Analysis of Daw Tway samples showed them to contain as much as 970 parts per million (ppm) of lead. The Daw Tway samples also contained high arsenic levels, as great as 7,100 ppm.”
Daw Tway is used as a digestive aid primarily in young children. It comes as a brown pellet or powder and is applied to the tongue. Most of the product has been brought into the US by travelers returning from Southeast Asia or arrived via shipments from family and friends in that region. (https://www.in.gov/isdh/files/Arsenic_and_Lead_Poisoning.pdf; accessed December 2018)