The bottle is a trap. Lemon-rosemary water looks like a clean ritual, yet every small pull can reset the mouth's acid clock: citric acid lowers pH at the enamel surface, while repeated sipping denies saliva the quiet interval it needs to buffer acid and return minerals to the tooth. You are not drinking once. You are dosing all day.
Teeth count frequency, not virtue. Enamel demineralization begins when an acidic environment persists; the acquired pellicle and saliva offer some defense, but they work poorly against a stream of fresh acid. Rosemary does not neutralize lemon. A bottle carried through meetings can turn one beverage into dozens of exposures, raising the odds of erosive tooth wear, sensitivity, and a rougher surface that holds stains.
Reflux makes this habit a bad bargain. Citrus is a symptom trigger for some people with gastroesophageal reflux disease, and constant sipping adds liquid and acidity when the esophagus may already be irritated. It does not cause reflux in everyone; lower esophageal sphincter function, meal size, posture, and individual tolerance matter. Drink it with a meal if tolerated, finish rather than graze, use plain water between meals, and wait before brushing after acidic drinks. Would you keep the bottle?