That’s a good question, and if you’ll permit me, I’ll give the answer in two parts. The acidity of seltzer is roughly the acidity of orange juice, so a squirt o

That’s a good question, and if you’ll permit me, I’ll give the answer in two parts. The acidity of seltzer is roughly the acidity of orange juice, so a squirt of lime in your water is just nowhere close. It is also true that most of what we should be drinking is water. I realize that’s not the first choice for people raised on juice, milk, and soda, but it’s certainly the most healthy. Remember that I mentioned moderation though? A glass or two of OJ, lemonade, tea, coffee, or seltzer a day isn’t going to materially impact your health assuming you’re not diabetic, and practice good oral hygiene. There are also many worse things for your teeth than seltzer, such as potato chips, and poor oral hygiene. If most of what you’re drinking is water, don’t sweat the glass or two of something other than water. Unfortunately too many poeple drink very little unadulterated water, and it does impact their health. Moderation is the key.