2 types of products to think about when you are trying to understand how a change in income affects the demand of a product - normal goods and inferior goods. 
 Normal goods : for most goods, as income rises, the demand for the product will also rise. Those goods are known as normal goods. As income rises, the demand curve will shift to the right. How much it shifts depends on the good itself. An increase in income may cause a small shift to the right in the demand curve for salt, but a huge increase in the demand for cinema tickets. 
 Inferior goods : when a product is inferior, the demand for it will fall as income rises, because consumers would start buying the higher priced substitute instead of the inferior ones. For example, a supermarket's brand of detergent. When people buys the higher priced detergents, the demand curve will shift to the left. When their income gets to a certain level, they'll only buy the higher priced ones and the demand for the product will be zero. Thus the demand curve will R.I.P. 
"But if you think about it logically, the curve for the inferior goods will never be gone, because there will still be people who doesn't get a raise in their income."
Sir Hazimi