<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344035</termId><termName>sodium fluoride</termName><termType>PT</termType><termNote><![CDATA[ Colorless, odorless, crystalline salt used in very dilute solutions to fluoridate water and treat tooth decay. In higher concentrations, sodium fluoride is used as a fumigant, and a preservative for zoological specimens, paint, plaster, wood, and masonry. ]]></termNote><termCreatedDate>2026-03-30 20:32:46</termCreatedDate><relation><relationType>UF</relationType><termId>31344036</termId><termName>fluoride, sodium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31343447</termId><termName>sodium compounds</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31320057</termId><termName>preservative by composition or origin</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31343833</termId><termName>fumigant</termName><termType>PT</termType></relation></term>  </Zthes>