A root spray is also effective when dealing with a double crown. It lifts the hair from the root scalps and compensates for the scarcity of hairs created by the double crowns. Using this spray with the help of the hair dryer gives a better output than using it alone.
Sticking to longer hairstyles is also a cure to the suffering from double crown. This will help you to grow hairs in the desired direction with proper layering of hairs. Keeping the hairs short is a big no for double crown as it aggravates the problem rather than curing it.