The chemical reaction of water and carbon dioxide results in a weaker acid called carbonic acid. Mustard stimulates the same nerve receptors in your mouth as carbonic acid, triggering a prickly, mild burning, or bubbling sensation that could be enjoyable or irritating depending on the person.  
How Does Carbonated Water Affect Digestion?
Carbonated water might improve:
Carbonated water might improve swallowing ability in young and older adults.   Studies show a combination of carbonation and cold temperature strengthened beneficial effects like stimulating the nerves responsible for swallowing. 
In a study of 72 people who consistently needed to clear their throats, 63% experienced symptom relief after drinking ice-cold carbonated water. 
Sparkling water could help food stay in your stomach longer, which makes you feel fuller. Carbonated water could boost satiety following meals more than plain water, but more larger studies are needed.  
Some studies reveal a decrease in constipation symptoms after the consumption of carbonated water. 
Sparkling water could also improve symptoms of indigestion like stomach pain. For example, one small study examined people with chronic digestive issues and uncovered that after 15 days, those who drank carbonated water had significant improvements in gallbladder emptying, constipation, and digestive symptoms. 
How Does Carbonated Water Affect Heart Health?
Research is limited but it does suggest carbonated water could improve heart health and increase ‘good’ HDL cholesterol.
For example, a study of 18 postmenopausal women revealed drinking sodium-rich carbonated water reduced the ‘bad’ LDL cholesterol, blood sugar, and markers of inflammation. Inflammation is believed to be a key driver behind countless diseases. The carbonated water group had a 35% lower risk of developing heart disease within 10 years compared to those drinking the control water. 
How Does Carbonated Water Affect Dental Health?
People raise concerns about the effect of carbonated water on teeth when the enamel is exposed to the carbonic acid. In one study, sparkling water damaged enamel only slightly more than still water. Sparkling mineral water was 100 times less problematic compared to a sugary soda. 
A review of several studies highlighted that combining carbonation and sugar might lead to severe dental decay. 
Plain sparkling water seems relatively harmless and poses little risk to dental health, whereas the sugary types can be harmful. 
One interesting study involved placing tooth enamel samples into different beverages for up to 24 hours. Compared to the diet drinks, non-carbonated and sugar-sweetened carbonated beverages caused greater enamel loss. 
Another study revealed carbonated drinks could potentially destroy enamel only if they contained sugar. Keto dieters won’t be drinking sugary carbonated beverages! Gatorade – a non-carbonated sweet drink was actually more harmful than Diet Coke – a sugar-free carbonated drink, suggesting sugar may be more of a culprit when it comes to dental decay. 
How Does Carbonated Water Affect Bone Health?