Generally speaking, toaster ovens are no more toxic than any other cooking appliance. A few reports have identified potentially harmful chemicals found in various parts that may make up a toaster oven. Try to avoid PFAS chemicals, often found in non-stick Teflon pans. Ensure your toaster oven is made from stainless steel, forgoing any plastic features, and you can also look for options that do not have a California Prop 65 warning label. This label tracks over 900 potentially harmful chemicals and is attached to products that use a higher level than deemed “healthy.” A toaster oven that does not have a Prop 65 warning label could generally be considered “safer.” However, consult a doctor for more information about chemical components found in everyday appliances if you are concerned.