Abstract: The present invention provides for a genetically modified gut bacterial cell capable of producing an antiviral compound. The genetically modified gut bacterial cell can be introduced to a subject to colonize the gastrointestinal tract of the subject, produce the antiviral compound and increase resistance to a virus infection.

Abstract: Dental desensitizing solutions and methods of using the solutions are disclosed. The solution may include an active ingredient, the active ingredient, when applied to a tooth, being configured to react with calcium in the tooth to produce a plurality of acid-resistant crystals that at least partially occlude dentinal tubules in the tooth. The solution may include a solubility enhancer, the solubility enhancer increasing the solubility of the active ingredient in the solution. The active ingredient may be oxalic acid, potassium salt dihydrate and the solubility enhancer may be sodium hydroxide, however, other active ingredients and solubility enhancers are disclosed. The solution may be applied to the tooth dentin and/or cementum to reduce hypersensitivity or pain from certain stimuli. The solution may increase the solubility of the active ingredient by at least 1.0 g/L at a given temperature. The solution may include at least 0.3 g/L of the solubility enhancer.

Abstract: A dental cleaning system and method is provided. The dental system contains: a first component containing an aqueous composition that includes —a carboxylic acid, a glycol, a metal chloride hydrate, water, and a surfactant; and, a second optional component selected from a metal carbonate, a metal bicarbonate, and mixtures thereof. The dental cleaning method includes: applying component one to teeth to be cleaned to thereby create a film over the teeth; optionally applying component two over the film created by component one and reacting the two components; and rinsing the teeth once cleaning is affected.