There are many factors that can disrupt the balance of the oral microbiome. Excessive sugar consumption, antibiotic use, smoking, poor oral hygiene, stress and dry mouth can all cause this balance to be disrupted. A diet high in sugar, in particular, increases the risk of tooth decay as it creates an environment conducive to the growth of harmful bacteria. Similarly, people who experience constant dry mouth have reduced saliva production and a weakened natural cleansing effect of saliva, which can completely alter the flora.