Dust to Dust is all natural and non-toxic. It is safe for use around humans and animals. However, the fine dust may prove to be irritating for some people, if breathed in directly. We encourage sensitive groups, such as individuals with allergies, to wear a face mask when spreading Dust to Dust to prevent breathing in the fine particles. If you are not using a mask, we recommend holding the applicator below the waist, away from your face.