The oral microbiome is not just about "killing germs." Like the gut, your mouth depends on a balanced microbial community. Pathogenic bacteria like Streptococcus mutans and Porphyromonas gingivalis thrive when this balance is disrupted, often by sugar, chronic dry mouth, or harsh antiseptic mouthwashes that wipe out beneficial species along with harmful ones [4].
Mercury amalgam fillings are approximately 50% mercury by weight. Mercury is a potent neurotoxin, and amalgam fillings continuously release low levels of mercury vapor, which increases with chewing, grinding, and hot beverages. In 2020, the FDA issued updated recommendations advising against amalgam fillings for pregnant women, nursing mothers, children under six, and people with kidney impairment or neurological conditions [2]. Many countries in Europe have already restricted or banned their use.
Root canals remain controversial. The focal infection theory, first proposed in the early 1900s and revisited by researchers since, suggests that bacteria can remain trapped inside the microscopic tubules of a dead tooth, potentially contributing to systemic health issues. While mainstream dentistry considers root canals safe, biological and holistic dentists often recommend extraction and biocompatible replacements instead.
Oil pulling — swishing oil (typically coconut or sesame) for 10 to 20 minutes — has been shown in clinical studies to significantly reduce S. mutans counts in plaque and saliva [3]. It appears to work through a mechanical "pulling" of bacteria and through the lauric acid in coconut oil, which has antimicrobial properties. See our Oil Pulling page for a deeper look.
Tongue scraping removes the bacterial coating on the tongue that contributes to bad breath and can harbor pathogenic organisms. It is a staple of Ayurvedic medicine and takes only seconds each morning.
Biological (holistic) dentistry integrates these concerns — avoiding mercury and fluoride, using biocompatible materials, considering the systemic effects of dental procedures, and treating the mouth as connected to the whole body rather than as an isolated system.
Dewhirst et al. (2010) catalogued the oral microbiome in the Human Oral Microbiome Database (HOMD), identifying over 700 prokaryotic species. Their work in the Journal of Bacteriology demonstrated that approximately 35% of these species remain uncultivated. They established that site-specific microbial communities differ significantly between the tongue, gingival sulcus, tooth surfaces, and saliva, emphasizing that the oral cavity is not a single environment but a collection of distinct ecological niches. Dysbiosis in any niche can create cascading effects throughout the oral ecosystem [1].
The FDA's 2020 safety communication on dental amalgam represented a significant regulatory shift. After decades of maintaining that amalgam was safe for all populations, the agency updated its recommendations to specifically warn high-risk groups. The communication acknowledged that mercury vapor is continuously released from amalgam fillings, that this release increases during chewing and grinding, and that certain populations may be more susceptible to adverse health effects. The agency recommended that these groups use non-mercury alternatives such as composite resins and glass ionomer cements whenever possible [2].
Peedikayil et al. (2016) conducted a randomized controlled trial comparing coconut oil pulling to chlorhexidine mouthwash. Using Dentocult SM Strip mutans tests, they found a statistically significant reduction in S. mutans colony counts in both groups after two weeks, with the oil pulling group showing reductions comparable to the antiseptic mouthwash. The study concluded that coconut oil pulling could be used as an effective adjunct to mechanical oral hygiene measures, offering an antimicrobial benefit without the side effects associated with chlorhexidine, such as tooth staining and altered taste [3].
Kilian et al. (2016) published an updated review for oral healthcare professionals in the British Dental Journal, arguing that the traditional "search and destroy" approach to oral bacteria is outdated. They presented evidence that disrupting the commensal microbiome with broad-spectrum antimicrobials can paradoxically increase susceptibility to pathogenic colonization. Their framework proposed that clinical oral care should aim to maintain microbial homeostasis rather than pursue sterility, a paradigm shift with implications for mouthwash use, antibiotic prescribing, and preventive strategies [4].