Nearly every popular beverage besides plain water contains some level of acid. Cola, fruit juice, coffee, wine, energy drinks, and even sparkling water all fall below a neutral pH of 7, making them acidic to varying degrees. Some are mild enough to be harmless, while others sit at a pH low enough to erode tooth enamel over time. Understanding where your favorite drinks land on this scale can help you make smarter choices for your teeth and digestive health.
How pH Works for Beverages
The pH scale runs from 0 (most acidic) to 14 (most alkaline), with 7 being neutral. Pure water sits right at 7, and saliva hovers around 6. Tooth enamel starts to break down when exposed to anything below a pH of roughly 5.5, so that number is a useful benchmark: drinks well below it pose a real risk to your teeth, especially with frequent sipping throughout the day.
Cola and Soft Drinks
Colas are among the most acidic beverages you can buy. A study published in the Journal of the American Dental Association tested hundreds of drinks available to American consumers and found that the most acidic ones, with pH values below 2.4, were dominated by colas. RC Cola measured at 2.32, Coca-Cola Classic at 2.37, and Pepsi at 2.39. For context, that puts them closer to stomach acid (around pH 1.5 to 3.5) than to water.
The main culprit in colas is phosphoric acid, which gives them their sharp, tangy bite. Non-cola sodas like lemon-lime and orange varieties typically use citric acid instead and tend to be slightly less acidic, though still well below the 5.5 enamel-erosion threshold. Diet versions aren’t meaningfully better in terms of acidity; the acid content stays roughly the same whether sugar is present or not.
Fruit Juices
Fruit juice often gets a health halo, but in terms of acidity, it rivals soda. Lemon juice measured at a pH of 2.25 in the same study, making it the single most acidic beverage tested. Cranberry juice came in at 2.56. Orange juice, grapefruit juice, and apple juice all fall in the 3 to 4 range.
The dominant acid in most fruit juices is citric acid. Fresh lemon juice contains about 48 grams of citric acid per liter, and fresh lime juice is close behind at 46 grams per liter. Grapefruit juice has about 25 grams per liter, while store-bought orange juice (like Tropicana) comes in around 17 grams per liter. Interestingly, commercially prepared orange juice actually contains more citric acid than juice squeezed fresh from an orange, likely because of processing and added ingredients.
These acids contribute to the tart flavor people enjoy, but they also mean that drinking large quantities of juice, or sipping it slowly over a long period, exposes your teeth to sustained acid contact.
Energy and Sports Drinks
Energy drinks are consistently acidic, with pH values ranging from 2.36 to 3.41 in laboratory testing. That puts the most acidic energy drinks right alongside cola. Citric acid is the primary acid used in most formulations, and research has shown it to be particularly erosive to enamel because it continues to pull minerals from tooth surfaces even after the surrounding pH has been neutralized.
Sports drinks like Gatorade and Powerade tend to fall in the 3 to 4 pH range. They’re less acidic than energy drinks on average, but still well below the 5.5 threshold where enamel damage begins. If you’re using them during exercise, the combination of a dry mouth (less saliva to buffer acid) and frequent sipping can amplify the erosive effect.
Coffee and Tea
Coffee contains a complex mix of organic acids, the most prominent being a group of compounds called chlorogenic acids. These break down during roasting into smaller acids that give coffee its characteristic sourness. Green (unroasted) coffee beans produce an extract with a pH of 6.3 to 6.5, which is barely acidic at all. Once roasted and brewed, coffee typically falls between 4.5 and 5.5, depending on the roast level and brewing method.
Lighter roasts tend to be more acidic than darker ones because the roasting process gradually destroys the acids responsible for sourness. If acidity bothers your stomach or teeth, choosing a dark roast or cold brew (which extracts fewer acids) can make a noticeable difference. Black tea generally falls in a similar range, around 4.5 to 5.5, while herbal teas vary widely depending on the ingredients.
Wine and Beer
Alcoholic beverages are acidic across the board. White wine and prosecco both measure around pH 3.3, putting them in the same ballpark as orange juice. Red wine is similar, typically ranging from 3.3 to 3.6. The acids responsible include tartaric acid, malic acid, and smaller amounts of citric acid.
Beer is less acidic than wine. A double malt beer, for example, measured at pH 4.29 in laboratory testing. Most beers fall between 4.0 and 4.5, with sour beer styles being the exception at pH values that can dip below 3.5. If you’re trying to minimize acid exposure, beer is a better choice than wine, though neither is neutral.
Sparkling Water
Plain sparkling water is mildly acidic, with a pH between 5 and 6. The carbonation process dissolves carbon dioxide into the water, creating a weak acid called carbonic acid. This is what gives sparkling water its slight tang and that fizzy sensation on your tongue.
At a pH of 5 to 6, plain sparkling water sits close to the 5.5 enamel threshold but is far less concerning than soda or juice. The acid is weak and doesn’t linger on teeth the way citric or phosphoric acid does. Flavored sparkling waters are a different story, though. Many brands add citric acid for taste, which can drop the pH into the 3 to 4 range, comparable to juice.
How Acidic Drinks Affect Your Body
The most well-documented risk of acidic beverages is dental erosion. Unlike cavities, which are caused by bacteria, erosion happens when acid directly dissolves the mineral structure of your enamel. The damage is cumulative and irreversible, since enamel doesn’t regenerate. Drinks with a pH below 4.0, consumed frequently, pose the greatest risk. Sipping through a straw, rinsing your mouth with water afterward, and avoiding brushing for at least 30 minutes after an acidic drink (when enamel is temporarily softened) all help reduce the damage.
For people prone to acid reflux, certain acidic beverages can worsen symptoms. Coffee, alcohol, and chocolate are common triggers, not just because of their acidity but because they can relax the muscular valve between the esophagus and stomach, allowing acid to flow upward. Citrus juices and carbonated drinks can also irritate an already inflamed esophagus.
Quick pH Comparison
- Most acidic (pH 2.0 to 2.5): Lemon juice, cola (Coca-Cola, Pepsi, RC Cola), some energy drinks
- Very acidic (pH 2.5 to 3.5): Cranberry juice, grapefruit juice, wine, prosecco, most energy drinks
- Moderately acidic (pH 3.5 to 4.5): Orange juice, apple juice, sports drinks, beer
- Mildly acidic (pH 4.5 to 6.0): Coffee, tea, plain sparkling water
- Neutral (pH 6.0 to 7.0): Milk, plain water