Harmful. Milk tea contains sugar and high calories, so you should be fine if you drink it occasionally. But remember, you must not buy cheap milk tea on the roadside. The pearls are all plastic and the milk tea is full of flavor. It is still recommended to drink drinks, boiled water is best. It’s also good to drink some hawthorn water that you brew yourself. It’s appetizing. Hawthorn is sold in the market and it’s delicious!