The yellowish teeth are the most common view in our smile. To improve color of teeth, whitening can be done. A mold needs to be prepared for making customized tray, which holds whitening gel on teeth. The bleaching tray can be placed any point of time when whitening is sheen off and fitted on teeth for several time and gel is applied. The tray holds gel for longer period of time. One can seek guidance from dentist for applying it once and then it can be applied on our own.