This shocking photo of a teacher's tongue highlights the sickening damage energy drinks can do to your mouth.
Dan Royals shared the snap on social manager to warn others about sugary drinks.
The teacher said he used to down up to six energy drinks every day until his doctor told him his health was suffering.
The medic apparently pointed out some beverages contain up to 58 grams of sugar per can and the excessive chemicals, including amino acids, B vitamins and herbal substances, were eating away at his flesh.
In his alarming post on Facebook group Get It Off Your Chest, Dan wrote: "Who drinks energy drinks? Addicted to them? You may want to think again.
"Have a look at the second pic... That's what that s*** does to your tongue, imagine what's it like on your internals?
"Up until recently when this started to occur I was drinking at least 5-6 a day (lack of energy teaching kids usually) and I brush daily, went to the doctor and boom! Found out it's the chemicals in these drinks that are causing it... It literally eats away at your tongue.
"So be wary guys."
Dan, an Australian who lives in Asia, admitted he smokes cigarettes but insisted the damage to his tongue was from the drinks.
The teacher added: "Just to make it clear, I actually do care for my oral health but this is purely from these drinks... I do smoke but has nothing to do with the eating away of my tongue."
Researchers recently stressed how sugar and acid, often found in drinks, can be extremely harmful to our tongue and teeth.
A study by world health organisation researchers states: "A study in the US showed that dental cavities can result from the acidic pH and high-sugar content of products such as energy drinks.
"Another study showed that consumption of energy drinks can cause erosion and smear layer removal in the teeth, leading to cervical dentin hypersensitivity."
It comes after a student, from Margate, Kent, snapped four front teeth after downing six Monster Energy drinks each day for months.
Vinnie Pyner, 21, claims he became hooked to the popular beverage to help him stay awake for his college studies.
But when he bit into an apple recently, the teeth snapped.
He said: "It started as a way to relieve the stress and pressure from my college course because you have to be focused when it comes to computing and coding.
"But I never thought that it would get this bad, it's affected my confidence dramatically."