This interesting article from Choice Magazine provides information about how and why dental decay occurs with specific results of their research on the link between acidity and sweetness in common foods and dental decay.
"Dental Decay - It’s not just sugary foods and drinks that are bad for your teeth, other nasties contribute to dental decay."The Worst Offenders - High-risk foods or drinks contain a lot of sugar and also have high acidity. These include some muesli bars and processed fruit snacks; high-risk beverages include soft drinks, fruit cordials and fruit drinks. Unfortunately, many of these foods are promoted as “healthy” snacks for kids’ lunch boxes."
This Choice article 'Dental Decay' provides good information on how to maintain healthy teeth and prevent dental decay.