# How Does Borax Kill Roaches? Things You Should Know Borax kills roaches by disrupting their digestive system when ingested. It acts as a poison, dehydrating the insect and causing death. When mixed with sugar, it attracts roaches, making it an effective, low-toxicity solution for controlling infestations. Visit: https://safepestsol.com/how-does-borax-kill-roaches/