Coke contains carbonic acid, which is an aqueous solution of carbon dioxide. In fact, the digestive system will not absorb too much co2 and will not cause too much calcium loss. What is bad for the body is that carbonic acid decomposes in the stomach, which will take away the temperature, stimulate the stomach and have an impact on the stomach. There is also cola with too high sugar content. Drinking for a long time is mainly bad for your teeth. First of all, it will cause tooth decay because of sugar. You know that. In addition, carbonic acid will dissolve a small amount of calcium in teeth, but only a small amount. So don't drink coke too often. What your father said was a misunderstanding.