Research shows drinking large amounts of fizzy drink could be as bad for your teeth as drugs.
The US study, published in General Dentistry, saw researchers explore the dental damage of a meth user, an ex-cocaine addict and an individual who drank two litres of fizzy drinks each day for around five years.
Each volunteer conceded they had poor dental hygiene and rarely visited the dentist. They all had the same kind and level of damage to their teeth.
"Each person experienced severe tooth erosion caused by the high acid levels present in their 'drug' of choice - meth, crack, or soda," said lead author Mohamed Bassiouny.
"The citric acid present in both regular and diet soda is known to have a high potential for causing tooth erosion."
The drugs in question include highly corrosive materials which harm teeth. Meth contains ingredients such as battery acid and drain cleaner.
Acid slowly destroys tooth enamel, which coats teeth, causing erosion. A lack of enamel can lead to cavities, cracks and staining, while teeth also become more sensitive.
"The striking similarities found in this study should be a wake-up call to consumers who think that soda - even diet soda - is not harmful to their oral health," added Bassiouny.
Copyright Press Association 2013