Product for the therapeutic treatment for the prevention and cure of oral cavity diseases of teeth and dental implants comprising a mixture in a polyvinyl alcohol aqueous solution, of one or more polyacids or their salts, of one or more antiseptics and/or anti-inflammatories, capable of obtaining in situ a protective and adhesive barrier, capable of facilitating the bioavailability of the aforementioned medicinal products, antiseptics and anti-inflammatories.