Know about the Good and Bad Bacteria in your Mouth

1 min


The oral environment is diverse. It serves as the home for many microorganisms. They hold the integrity of the oral environment and gut health.

The bacteria present in our mouth have a correlation to each other. This interrelation helps in maintaining an oral healthy environment as well as showing a negative impact on oral health when there is an imbalance.

How does the bacteria enter our mouth?

These bacteria usually colonize over one another. They initially enter our mouth through the following ways:

  • Firstly, these enter through breastfeeding after birth.
  • Through foods like fruits, vegetables, milk, etc.
  • Contact with others.
  • Swapping of food articles.

Some after entering into our mouth stay for a longer duration while the rest die at the change of the medium.

Where does the bacteria stay in our mouth?

The bacteria can adhere to any of the following:

  • Teeth surface.
  • Gums.
  • Tongue.
  • Cheeks.
  • In-between two teeth.
  • Upper pharynx region & throat.

Good Bacteria and its Effects on Health:

The most common good bacteria present in our mouth include Lactobacillus sps., Clostridium sps., Bifidobacterium sps., etc.

These bacteria are acquired through foods and dairy products. They are also called as probiotics and considered as one of the supplementary foods.

Their help in promoting good gut health, proper digestion, to fight against the other bad bacteria and to maintain the balance in the environment.

Bad Bacteria and its Effects on Health:

The following species of bacteria are usually present in the oral cavity:

  • P. gingivalis.
  • Streptococcus sps. (Major part of the oral environment).
  • Neisseria sps.
  • Treponema sps.
  • Actinimyces sps.
  • Other anaerobic bacteria’s.

However, these only activate and cause harm to teeth and other oral tissues when there is an imbalance effecting them.

The bad bacteria causes the following effects:
  • Tooth decay.
  • Gum diseases.
  • Ulcers.
  • Deposition of layers on the tongue.
  • Bad breath.
  • Bleeding and swollen gum diseases.

How does the inter-relationship between good and bad bacteria is broken?

The break in the inter-relationship between good and bad bacteria happens through the following:

All of the above when exceeding certain limit or when not followed properly can lead to a negative shift in the oral environment.


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Dr Arun

Dr. Arun is a practicing dentist with more than 11 years of experience. Loves to blog and in constant search of new knowledge in dentistry and health niche.