Why does the mouth smell foul after a long night's sleep?

August 30, 2015 05:00 pm | Updated March 29, 2016 06:06 pm IST

Photo: Rajeev Bhatt

Photo: Rajeev Bhatt

Amol Chaurasia, Lucknow

Bad breath in the morning is mostly attributed to a lack of saliva. During the day, your mouth produces a significant amount of saliva, but while you sleep, saliva production goes down.

Saliva is critical for sweeping away the food particles that would otherwise linger and collect bacteria.

A decrease in saliva production increases the likelihood of dry mouth. This allows bacteria to grow and produce volatile sulphur compounds (VSCs), which is what smells bad. Bacteria munch on compounds, proteins, amino acids, and leftover foods that are stuck in your mouth and teeth to produce these VSCs, which causes the bad odour.

The way you sleep can also affect the intensity and frequency of morning breath. Snoring or breathing through the mouth at night can increase the likelihood of bad breath. Most mouth breathers sleep with their mouth open, causing their mouth to get drier and therefore letting bad-breath-causing bacteria flourish. Basically, any time you reduce saliva in the mouth, you reduce the mouth’s ability to fight the bacteria that causes the bad breath.

Dolly Rohira,Bengaluru

This week’s question

What will happen if Earth stops its rotation?

V. Rajasekar, Sivakasi,

Tamil Nadu

Readers can send questions/answers on science and technology for the Question Corner, along with their names and addresses, to the email ID questioncorner@thehindu.co.in or to The Editor, The Hindu (Science and Technology), 859-860, Anna Salai, Chennai 600002.

0 / 0
Sign in to unlock member-only benefits!
  • Access 10 free stories every month
  • Save stories to read later
  • Access to comment on every story
  • Sign-up/manage your newsletter subscriptions with a single click
  • Get notified by email for early access to discounts & offers on our products
Sign in

Comments

Comments have to be in English, and in full sentences. They cannot be abusive or personal. Please abide by our community guidelines for posting your comments.

We have migrated to a new commenting platform. If you are already a registered user of The Hindu and logged in, you may continue to engage with our articles. If you do not have an account please register and login to post comments. Users can access their older comments by logging into their accounts on Vuukle.