The pellicle is a microscopic coating formed on your teeth from saliva. In the GAPS dental chapter, Dr. Natasha Campbell-McBride connects that layer with lubrication, protection and the mouth’s microbial community. It is also where she explains her recommendation to brush with olive oil, coconut oil or another natural fat.[1]
What the Pellicle Does
The book describes a mesh containing proteins, lipids, minerals and other components from saliva and food. It describes saliva as helping maintain mouth pH, remineralize enamel and support the oral microbial community, with about 1.5 liters produced daily in a healthy body. Campbell-McBride also says that roughly 400 commonly prescribed medicines can reduce saliva, and names amalgam materials, chronic stress and food additives as other contributors to dryness. It makes the tooth surface slippery and helps protect it from mechanical damage. Microbes settle on this surface and add their own substances, forming a biofilm.[1]
That gives the chapter two connected concerns: nourishment for the tooth’s protective surface and a balanced microbial community. A healthy mouth is not simply a mouth with no microbes. The oral-microbiome guide follows that part of her explanation.
The Research Cited for This Layer
Baek and colleagues’ 2009 study visualized pellicle formation on enamel samples incubated with human saliva. Their optical images showed developing islands becoming a continuous layer. That supports an explanation of the coating as a real, changing structure on enamel. It was an imaging study, not a trial assigning people to eat more fat or brush with coconut oil.[2]
Campbell-McBride says eating more natural fat strengthens the pellicle and recommends natural-fat brushing to support that protective layer. Those recommendations come from her account; the imaging paper studied how the salivary coating forms.[1]
The Oil-Brushing Method in the FAQ
In the official FAQ, the answer to a reader with sensitive teeth recommends a good-quality cold-pressed olive oil: dip the toothbrush into it, brush as usual and rinse with water. The answer specifies twice-daily brushing. The child-focused FAQ also recommends olive-oil brushing twice a day. The book also names coconut oil and other natural fats as alternatives in its pellicle discussion.[3][1]
The FAQ links this approach to the older practice of oil pulling. Brushing with an oil-coated toothbrush and swishing oil in the mouth are different actions.
The Sensitive-Teeth Answer Has Food Context
That same FAQ answer emphasizes animal fats and vitamins A, D and K, and names cod liver oil and homemade sour cream from raw cream. It also tells the reader to reduce fermented vegetables temporarily and drink their juice in soups or meat stock while addressing the sensitivity. These are details of that specific answer, with dairy and food introduction still following the wider GAPS rules.[3]
If chewing ferments hurts, note the food and the sensation so you can explain it at a dental visit. Sensitivity is worth understanding. Neither this method nor a white-looking tooth tells you whether there is an established cavity. The enamel guide explains the distinction between early demineralization and a hole.
Keep the Routine Simple
Set out the brushing materials where they are easy to use, keep the brush clean, and keep track of any changes in comfort or appearance. For a family, a routine people can repeat is more useful than an elaborate bathroom setup that adds another job every morning.
The book’s food approach remains part of this discussion. The collagen food guide explains the meals and stock ingredients; the bones-and-teeth overview helps you find the other dental topics.
Questions About Oil Brushing
Is Coconut Oil the Only Oil the Book Names?
No. The book names olive oil, coconut oil and other natural fats. The sensitive-teeth FAQ specifically describes cold-pressed olive oil.[1][3]
Does the Pellicle Study Prove That Oil Brushing Heals Cavities?
No. It examines formation and imaging of the salivary coating. It does not establish a cavity-healing result from an oil-brushing routine.[2]
Your Next Step
Use the source-described brushing method as one part of your mouth-care conversation, and note the questions you want answered about sensitive areas or existing dental work. My GAPS Lifestyle course is listed in the WFLI Shop.
References
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “Our Teeth and Bones,” pp. 106–117.
- Baek, J. H., et al. (2009). Optical approach to the salivary pellicle. Journal of Biomedical Optics, 14(4), 044001. doi:10.1117/1.3158994. Author-hosted full text.
- Campbell-McBride, N. Official GAPS FAQs, “Teeth,” questions 7, 8 and 12.
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