Bicarbonates happen to be excellent anti-fungal agents. Julia Roberts is famous for her bright smile and the actress says she owes it to her grandfather’s tip of using baking soda. “I brush [my teeth] with baking soda. [My grandfather] would put a big heaping mound of it on his toothbrush. He had only one cavity in his entire life,” Roberts said.
Yes it keeps her teeth white but it does much more than that. Sodium bicarbonate, used in toothpastes and in dental teeth-cleaning devices, is the very best agent for the maintenance of oral health because it changes pH, radically disrupting the constantly rising tide of bacteria and fungi that threaten the health status of the entire body.
With ample brushing, sodium bicarbonate has the power to break through pathogen films, called biofilms, that sticky stuff that turns into hard tarter that your dentist has to remove while you grin and bear it. Studies have shown that bicarbonate inhibits plaque formation on teeth and, in addition, increases calcium uptake by dental enamel. Sodium bicarbonate increases the pH in the oral cavity, potentially neutralizing the harmful effects of bacterial and fungal metabolic acids.
 A complex structure adhering to surfaces that are regularly in contact with water, consisting of colonies of bacteria and other microorganisms such as yeasts, fungi, and protozoa that secrete a mucilaginous protective coating in which they are encased. Biofilms can form on solid or liquid surfaces as well as on soft tissue in living organisms, and are typically resistant to conventional methods of disinfection. Dental plaque, the slimy coating that fouls pipes and tanks, and algal mats on bodies of water are examples of biofilms.