Sweet tea and soda are both hard on your teeth, but soda is generally worse. It’s more acidic, which means it dissolves enamel faster, and a standard 12-ounce cola packs around 40 grams of sugar. Sweet tea can match or even exceed that sugar load depending on the brand and serving size, but its slightly higher pH gives it a small edge in the acidity department. The real answer, though, depends on what you’re drinking, how much of it, and how you drink it.
Sugar Content: Closer Than You Think
A 12-ounce can of Coca-Cola Classic contains about 40.5 grams of sugar. Pepsi has 41 grams. Dr Pepper sits at 39. These numbers are remarkably consistent across major cola brands.
Sweet tea is more of a wild card. Homemade recipes vary enormously, and commercial brands range from 12 grams per 12 ounces (Milo’s lighter version) all the way up to 44 grams in an 18.5-ounce Gold Peak bottle. Brisk iced tea has just 18 grams per 12 ounces, while Snapple lands around 37 grams per 16 ounces. The catch is that sweet tea bottles are often 16 to 20 ounces, not 12, so the total sugar you consume in one sitting can easily surpass a can of soda even if the per-ounce concentration is lower.
Sugar matters for your teeth because bacteria in your mouth feed on it and produce acid as a byproduct. More sugar means more acid production, which eats away at enamel. Whether that sugar comes from tea or soda, the bacteria don’t care.
Acidity: Where Soda Pulls Ahead
Tooth enamel starts to dissolve at a pH of about 5.5. Both sweet tea and soda fall well below that threshold, but soda is meaningfully more acidic. A large study of U.S. beverages found that sodas averaged a pH of 3.12, while teas averaged 3.48. That difference matters more than it sounds: the pH scale is logarithmic, so soda is roughly two to three times more acidic than sweet tea on average.
The type of acid also plays a role. Colas contain phosphoric acid, while many iced teas and fruit-flavored sodas use citric acid. Research on which acid erodes enamel faster has produced mixed results, but both are clearly damaging. One lab study that soaked teeth in Coca-Cola and Lipton Ice Tea Lemon for 30 days found similar total enamel loss from both beverages over time, though the mechanisms differed slightly.
The bottom line: soda starts with a lower pH and attacks enamel more aggressively per sip. Sweet tea is acidic enough to cause erosion too, just not quite as quickly.
How You Drink It Matters
One of the biggest factors in dental damage isn’t which drink you choose. It’s how long your teeth are exposed to it. Sipping a drink slowly over an hour bathes your teeth in sugar and acid repeatedly, giving mouth bacteria more time to produce their own acid on top of what’s already in the glass. Drinking more quickly and finishing in one sitting lets your saliva do its job: neutralizing acid and washing sugar away.
This is where sweet tea can become a bigger problem than soda in practice. People tend to nurse a glass of sweet tea throughout a meal or an afternoon, while a can of soda is often finished in 10 to 15 minutes. If you’re refilling a 32-ounce cup of sweet tea at a restaurant and sipping it for an hour, your teeth are getting a prolonged acid and sugar bath that may do more cumulative damage than a single quickly consumed soda.
Lemon and Other Additives
Adding lemon to sweet tea, a common habit in the South, makes the drink significantly more erosive. Citric acid from lemon juice lowers the pH further and is a potent enamel destroyer on its own. Some citric acids found in fruit drinks are more erosive than hydrochloric or sulfuric acid. Dental experts recommend skipping lemon, sugar, and milk as tea additives because they reduce the natural benefits of tea’s plant compounds while increasing the damage.
Sweet tea with lemon is a meaningfully different drink, from a dental perspective, than sweet tea without it. If you’re choosing between a lemon-spiked sweet tea and a cola, the gap between them narrows considerably.
Tea’s One Advantage: Fluoride
Black tea leaves are natural accumulators of fluoride, the same mineral added to tap water and toothpaste to strengthen enamel. Brewed black tea contains a substantial amount of fluoride, with 74 to 85 percent of it coming directly from the tea leaves rather than the water used to brew it. This gives sweet tea a small protective factor that soda completely lacks.
That said, fluoride in sweet tea doesn’t cancel out the damage from 40 grams of sugar and a pH below 5.5. It’s a minor silver lining, not a free pass.
Staining: Tea Wins This One (in a Bad Way)
If you care about the color of your teeth, tea is the worse offender. Black tea contains tannins, plant compounds that bind to enamel and cause yellow or brown discoloration over time. Soda can also discolor teeth, but it does so indirectly: by eroding enamel and exposing the layer underneath (called dentin), which is naturally darker and more yellow than the enamel surface. Both pathways lead to less-white teeth, but tea staining is more noticeable and happens faster with regular consumption.
The Overall Verdict
For structural damage to your teeth, soda is worse. It’s more acidic, consistently high in sugar, and contains no beneficial compounds. Sweet tea is not far behind, especially when served in large portions, sipped slowly, or mixed with lemon. The sugar content of many commercial sweet teas rivals or exceeds a can of cola once you account for larger serving sizes.
If you’re trying to pick the lesser evil, unsweetened or lightly sweetened tea with no lemon is a clear step up from soda. A fully loaded sweet tea, on the other hand, is close enough to soda in sugar and acidity that your teeth won’t notice much difference. Drinking either one quickly rather than sipping over a long period, rinsing with water afterward, and waiting 30 minutes before brushing (to avoid scrubbing softened enamel) are the most practical ways to limit the damage from either drink.