Wartner Pro is designed for external use only. Only use Wartner Pro in combination with the special applicators. These applicators have different sizes that can be used for warts of various dimensions. Each size has its own color. Use one applicator for each wart and use it only once. Wartner Pro can be stored for three years and has no unfavorable effect on the environment. The use-by date can be found on the packaging and on the underside of the aerosol. The contents of Wartner Pro are inflammable, so protracted exposure to the sun or extreme heat is dangerous. Do not smoke while applying Wartner Pro. Store in a safe place and out of reach of children.