Good Bacteria vs Bad Bacteria

There are actually over 700 kinds of bacteria in your mouth, but not all are BAD.

A lot of them are truly beneficial to your oral health. When the bad bacteria in your mouth outnumber the good bacteria, it causes an increased risk of gingivitis, periodontal disease, and tooth decay.
Rather than trying to kill all the bacteria in the mouth, controlling the growth of bad bacteria in your mouth is more crucial for your oral health care.

Good Bacteria
Your mouth needs GOOD bacteria. Good bacteria tend to thrive in neutral to high pH environments. When you have an abundance of good mouth bacteria, these help kill the bad bacteria that can lead to oral health problem such as bad breath, dry mouth, cavities or gum problems.


Bad Bacteria
If you have excessive levels of BAD mouth bacteria, this can increase your risk of developing cavities, tooth decay, gum inflammation, gingivitis, periodontal disease, and even bad breath.

good bacteria and bad bacteria in the mouth

Maintaining optimal oral health goes beyond brushing and flossing alone. Within our mouths, there exists a complex ecosystem known as the oral microbiome, comprising a vast array of microorganisms, including good bacteria and bad bacteria. These microscopic inhabitants play a crucial role in our oral health, and understanding the delicate balance between them is key to achieving and maintaining a healthy mouth. In this article, we will delve into the world of oral microbiome, exploring the significance of good bacteria and the potential harm caused by bad bacteria, all in the pursuit of a flourishing oral environment.

The Oral Microbiome: A Complex Ecosystem

The oral microbiome refers to the diverse community of microorganisms that reside within our mouths. It is home to billions of bacteria, viruses, fungi, and other microorganisms, collectively working together in a delicate balance. This intricate balance is critical for maintaining oral health, as any disruption can lead to a host of dental issues.

Good Bacteria: Guardians of Oral Health

Among the myriad microorganisms inhabiting our mouths, there are several strains of good bacteria that play a crucial role in promoting oral health. These beneficial bacteria help maintain the natural balance of the oral microbiome, keeping harmful pathogens in check and contributing to overall well-being.

One such strain of good bacteria are Weissella cibaria CMU and Weissella cibaria CMS1, known for its ability to inhibit the growth of harmful bacteria. This bacterium produces antibacterial compounds that help prevent the colonization of disease-causing microbes, thus contributing to the overall health of the oral cavity.

Maintaining a balance between these good bacteria and other microorganisms is crucial, as it helps prevent the overgrowth of harmful bacteria and the subsequent development of oral diseases.

Bad Bacteria: The Culprits of Oral Woes

In contrast to the good bacteria, there exist certain strains of bad bacteria that can wreak havoc on our oral health when their population surpasses the optimal balance. These harmful microorganisms, such as Streptococcus mutans and Porphyromonas gingivalis, are associated with various dental issues, including tooth decay, gum disease, and bad breath.

Streptococcus mutans, for instance, thrives on sugars and produces acids that erode tooth enamel, leading to the formation of cavities. Porphyromonas gingivalis, on the other hand, is strongly linked to periodontal disease, a severe form of gum disease that can result in tooth loss if left untreated. These bad bacteria can cause inflammation, tissue damage, and an overall imbalance in the oral microbiome.

The Role of Balance: Striving for Equilibrium

Maintaining a healthy oral microbiome is all about balance. When the population of good bacteria is robust and thriving, they can effectively compete with the bad bacteria for resources and space within the oral cavity, preventing their overgrowth.

However, various factors can disrupt this delicate balance, tipping the scales in favor of bad bacteria. Poor oral hygiene practices, a sugary diet, tobacco use, stress, and certain medications can all contribute to an imbalance in the oral microbiome, creating a favorable environment for harmful bacteria to thrive.

Oral Probiotics: Nurturing the Good

As we delve deeper into the world of oral health, the concept of oral probiotics emerges as a potential solution to restore and maintain a healthy balance within the oral microbiome. Oral probiotics are beneficial bacteria strains that, when introduced into the mouth, can help replenish the population of good bacteria and restore the natural equilibrium.

These probiotics, often available in the form of lozenges, gum, or mouthwashes, work by adhering to the surfaces of teeth and oral tissues, effectively competing with and inhibiting the growth of bad bacteria. By bolstering the population of good bacteria, oral probiotics can promote a healthy oral environment, reducing the risk of dental issues and supporting overall oral health.


The intricate dance between good bacteria and bad bacteria within the oral microbiome plays a pivotal role in determining our oral health. Striving for a healthy balance is key to preventing dental problems and maintaining a flourishing oral environment. By understanding the significance of good bacteria in inhibiting the growth of bad bacteria, we can explore innovative approaches like oral probiotics to promote oral health and restore equilibrium within the oral microbiome. So, let's embrace the power of good bacteria and prioritize the maintenance of a healthy oral microbiome for a lifetime of oral well-being.