Duraflor Ultra’s advanced formulation provides our fastest fluoride release by optimizing the fluoride release rate over a 4 hr. period. Ultra varnish has a smooth consistency that is easy to apply and dries to a natural tooth color. Duraflor Ultra does not contain nuts, gluten, dairy products, wheat, egg, soybean, fish, shellfish, DEHP or BPA, thus ensuring it is safe for most patients.