Roasted vegetables bad for teeth

Scientists have issued a warning over the high levels of acid found in roasted vegetables.

In a study conducted at a Dundee dental school researchers found that oven-roasting vegetables significantly increased the acidity of vegetables such as green peppers, aubergines and courgettes- the ingredients commonly found in ratatouille.

The increase in acidity makes the vegetables as acidic as fizzy drinks.

Dr Graham Chadwick who led the study said: “The acidity of ratatouille prepared by oven-roasting is the same as that of some carbonated drinks that, when consumed in excess, are believed to contribute to the development of dental erosion.”

Results of the study contribute to suggestions that vegetarians are at higher risk of tooth decay because of the natural acid in fruits and vegetables. Direct contact of acid with teeth can destroy their natural protective layer, leading to dental erosion.

Dr Chadwick says the findings of the study could be used by dentists to advise their patients.

The study, which was published in the European Journal of Prosthodontics and Restorative Dentistry, found that the acidity level in tomatoes and onions remains unchanged regardless of the method of cooking.

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