Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: This is why your vanilla or cinnamon flavoured e-cigarette is toxic > Health-in-Motion 12 December 2017 Your mouth is home to a plethora of different bacteria You might be surprised to hear that your mouth is home to a plethora of different bacteria. But don’t be alarmed, many of the hundreds of species of microorganisms that live in your saliva play an important role in defending you against a variety of harmful pathogens attempting to enter your body. Recently, British researchers have discovered that the particular mix of these salivary microbes is not passed on from parent to child, but is mostly determined by the household environment in which you grow up as a small child. 0 NEXT ON HEALTH24X 'Help! My baby's cough sounds like a dog's bark' 2019-08-24 10:00 More: Daily Dose: This is why your vanilla or cinnamon flavoured e-cigarette is toxicHealth-in-Motion advertisement Other news Medical 10 things to know about your vagina that'll change how sex feels Mental health How toes become fingers in the brains of 'foot painters' Mental health Lots of time on social media linked to anxiety and depression in teens Medical Why obese teen boys could be prone to heart attacks in middle age Diet and nutrition WATCH: Science has discovered that cheese is as addictive as cocaine Medical WATCH - Why loud chewing has kept this man from talking to his family for years Live healthier Heart health » 5 women share exactly what it feels like to have a heart attack 'I felt like I had a pill stuck in my throat.' Diet & Nutrition » 8 benefits of gherkin juice that will make you want to drink some ASAP Goodbye, salt craving.