'A teacher who consumed at least six energy drinks per day has shared a shocking image of his blistered and peeling tongue.
Dan Royals posted the picture of his damaged mouth to warn people about the dangers of energy drinks which contain up to 58 grams of sugar per can.
He said he used to drink at least five or six per day until his doctor told him excessive sugar and chemicals - including amino acids, B vitamins and herbal substances - were eating away at his flesh.
In his post on Facebook group Get It Off Your Chest, he 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.'
Mr Royals, an Australian who lives in Asia, admitted he smokes cigarettes but insisted the damage to his tongue was from the drinks.
'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,' he said.'
Read more: Teacher who drank at least SIX energy drinks a day claims the chemicals they contain have eaten away at his tongue