Compliance depends on whether the brush is manual or electric. For electric ceramic straightening brushes, you must ensure CE, RoHS, and REACH compliance for the European market, and UL or ETL certification for the United States. For manual thermal brushes, focus on material safety data sheets (MSDS) to confirm that the handle and coating materials are non-toxic and free from heavy metals. Always verify that the manufacturer holds an ISO 9001:2015 certification to guarantee consistent production quality.