Many people often forget to close the door when they enter or leave a room. This is an annoying habit that people do not seem to want to change. Leaving the door open allows air conditioned air to escape to unwanted places. In case of a toilet, leaving the door open will let foul smells to escape into living spaces. Another common problem with doors is banging. There are people who love shutting doors with force. This can startle or shock other occupants of the building.
The best way to resolve all door-related problems is to install a spring loaded door hinge. There are many makes and models of these special springs, so be sure to do your own research and compare them before picking a hinge to install. The installation should be done by a licensed professional with a lot of experience in the industry.