Are they still at risk for tooth decay?

Yes. Prolonged exposure to soda water may cause injury. Having a soft drink all day long is bad for your teeth, instead of drinking soda in one meal and then not drinking any soda for the rest of the day. Although many dentists advocate drinking nutritional beverages such as milk, many people believe that soda water should be consumed from cans instead of bottles with replaceable bottle caps to prevent prolonged exposure to soda.