While very high heat can potentially kill bedbugs, the Live Free dryer sheets finish the job by dispersing KiltreX powder onto clothing and bedding in the dryer. KiltreX is a proprietary blend of plant-based materials that kills bedbugs by attacking the parasites skeletal structure. We recommend consumers treat dryers with KilSpray (sold separately) first, as bedbugs like to hide in and around these dark, warm spaces. Live Free products are completely toxic-free, making them safe for use around children and pets. In addition to bedbugs, they also effectively control fleas, ticks, mites, scabies, silverfish, carpet beetles, cockroaches and German cockroaches. This item can be used in conjunction with other Live Free products to create a comprehensive bed bug barrier system that eliminates existing infestations and protects every part of the home 24/7 from the potential of re-infestation.