Canadian oak broom for massage and inhalations in the sauna. The Canadian oak broom can be used as a healing agent in the sauna. This broom in the sauna reveals all its healing properties. Tannin in oak leaves is a substance that acts as a natural astringent, providing a soothing property, as well as astringent pores, making it perfect for oily skin. Flavonoids in oak leaves are substances that have been proven to be powerful antioxidants. The oak has a rich aroma that is produced by steaming, which helps to relax and reduce stress.