Marketplace tested Perrier, LaCroix, Bubly sparkling waters to see which is most acidic

When it comes to your teeth, sparkling water isn't always as safe as you might think it is.

Some flavours could be hazardous to your oral health.

To see which products pose the greatest potential risk to your smile, Marketplace tested a number of Perrier, Bubly and LaCroix sparkling water flavours available on Canadian store shelves to find out which are most acidic.

WATCH | The truth about sparkling water and your teeth:

Everything we eat and drink has a pH level; the lower the pH level, the higher the acidity. Food and drinks that are acidic can pose a risk to your teeth because they can weaken a tooth's enamel (the outer, protective layer of your teeth). 

The Canadian Dental Association says people should be mindful of drinking some carbonated water drinks because "the higher acid levels significantly increase the risk of damage to tooth enamel and can increase the risk of erosion of the enamel and tooth decay." 

Unlike regular water from your tap, which has a neutral pH of between six and seven, some flavoured and sparkling waters can be acidic. 

"When we have a pH below five, this can be a danger," said Dr. Walter Siqueira of the University of Saskatchewan's school of dentistry. 

Previous studies have found some flavoured carbonated waters to have pH levels as low as three, just slightly better than Coca-Cola, which has been found to have a pH of just over two. 

Using a pH meter and pH test strips, Siqueira and his team at the University of Saskatchewan measured the acidity of the selected drinks. All were found to have a pH of below 5.5, and some were considerably more acidic than others. 

Bubly had the most acidic products Marketplace tested. Its cherry, grapefruit and lime flavours all had pH levels below four.

Interestingly, the pH levels in the grapefruit flavoured-products Marketplace tested varied significantly. 

Bubly's grapefruit flavour was considerably more acidic than the other two brands tested with a pH of 3.86, compared to LaCroix's 4.71 and Perrier's 5.46. 

Siqueira said pH levels below four can start wearing down enamel, which is irreversible. However, the potential impact on your teeth has a lot to do with how, and how often, you consume the product.