Irregular Teeth Alignment Device - Made by using Original Proven Chiense Teeth Care Method -- Patients can take on and off by themselves. (Important: Due to popularity of brand “Cool & Fresh” many people has started selling duplicate product under our trade name, so it is advise from us (owner of Cool & Fresh) that to receive original product buy always from Amazon and on Amazon only from the owner of Cool & Fresh that is creativesuccess24.)Made of medical grade plastic - Safe for human body -- Size:7.7cm * 6cm * 2.5cm/3.03" * 2.36" * 0.98"Please note: To receive the general instruction file reference to this product, please message to us (to seller) form your order detail – we will send you a pdf file containing necessary information. As it is not possible to provide specific instruction because condition and positioning of teeth of everyone is different, but how to wear it, normal time to wear, when to use soft tray and when to use hard tray, wash care instruction and some other points you need to know have been included in this