... PSA theory.It can separate medical-usepurified oxygen (high density,no dust,no bacteria) from air under normal temperature ... bemish,tighten large hair pores,deeply cleaning and improve the flexibility and tone of skin.2.Scar removal: remove scar caused ... dust mites, chemicals used in grooming and cleaning, off-gassing of carpets, furniture, and upholstery, and particles from the outdoors such as pollens ...