Each application if correctly applied should last for up to 3 hours, though this will vary from person to person. Olive oil, mineral oil and tea tree oils are natural products and have wide daily applications within personal skin care cosmetic products. The actuator button can be removed and rinsed in hot water after use and then seated back on the stem. This product should not be used if you have a sensitivity or allergy to olive, mineral or tea tree oils. If you feel you have experienced an allergic reaction stop using this product and inform your Doctor, Nurse, or Pharmacist..