Abstract: Embodiments of the invention include a system having a plant stem cell product and a delivery device configured to deliver an effective amount of the plant stem cell product to the oral cavity or nasopharynx. In some embodiments, the delivery device may include an aerosolizing device, an adherent dressing, a tooth-adherent flexible strip, a treatment tray, a viscous adherent carrier, a brush, a paste, a flosser, a dissolving oral strip, a gum, a chew, a smoking material, a nasal packing, or a lozenge. The plant stem cell products may include encapsulated extracts of plant stem cells, such as food species stem cells, spice or other seasoning stem cells, or medicinal plant stem cells.