Dental Erosion was caused by lemon consumption over a lifetime. Lemons are highly acidic and strip the mineral enamel off the teeth every time the lemon juice makes contact.
Other acids that can have similar effects are stomach acid (reflux), wine, sports drinks and acidic soft drinks like Coke, Pepsi, lemon squash etc. Switching to sugar free versions will not remove the acid attack and teeth will still erode with diet versions of these drinks.
The effect is compounded if there is decreased salivary flow. Being dehydrated or after exercise, the mouth becomes vulnerable to acid attack. Drugs can also have a side effect of a dry mouth : antihistamines, high blood pressure medications, sedatives, decongestants, analgesics, antidepressants and illegal drugs such as cocaine.
Combining a dry mouth with acidic drinks accelerates the erosion process.
Excercise and dehydration + sports drink = high risk of enamel erosion.