Are reusable water bottles a hotbed for mouth bacteria?

Reusable plastic bottles have become a trend, often carried everywhere to ensure adequate hydration. But if these bottles aren’t washed daily, they can collect bacteria and even mould. "The catch is that most of these germs don’t come from the bottle itself, but from the user’s own mouth. Each time we drink, bacteria transfer into the bottle, creating the perfect environment for growth when moisture and warmth are present," said Dr Aniket Mule, consultant, internal medicine, KIMS Hospitals, Thane. (Photo: Getty Images/Thinkstock)

Some might dismiss it, thinking its harmless since the bacteria comes from the body. "But once bacteria multiply inside a closed, damp space, they become harmful," cautioned Dr Mule. (Photo: Getty Images/Thinkstock)

According to Dr Mule, this build-up can lead to stomach infections, sore throats, and even fungal issues if the mould is inhaled or swallowed. "People with weaker immune systems, like children, elderly individuals, or those with chronic illnesses, are especially vulnerable," said Dr Mule. (Photo: Getty Images/Thinkstock)

Plastic bottles with straws or flip tops are more difficult to clean adequately; however, do not throw them away irresponsibly. (Photo: Freepik)

Dr Mule added that small cracks and rubber seals hold water as a place for the bacteria colonies to grow without anyone knowing. "Even clear bottles are capable of holding an unseen biofilm, a sticky deposit embedded in the bottle that protects the bacteria and makes it more resistant to cleaning. Without regular cleaning, users can suffer frequent minor ailments such as gastrointestinal upset, unexplained low energy, or chronic irritation of the throat," said Dr Mule. (Photo: Freepik)

What can help reduce the risk? Cleaning bottles with warm soapy water every day and allowing them to dry fully prior to reuse. (Photo: Freepik)

Stainess steel or glass can also limit bacterial growth, as they will not scratch like plastic. (Photo: Getty Images/Thinkstock)

"Not using the same bottle every day should help minimise the risk. Most importantly do not share bottles, because sharing will just double the bacterial transfer," said Dr Mule. (Photo: Getty Images/Thinkstock)

Bringing a water bottle is a good health habit, but neglecting its cleanliness can silently damage the body. "A bit of attention to cleaning can ensure your hydration buddy fully benefits your health," said Dr Mule. (Photo: Getty Images/Thinkstock)