works as described [SEP] i have only used this for about two weeks three times a day and while i have not noticed a considerable difference i am sure that with more use my sight double chin will tighten up it is easy to use and can be used pretty much at anytime when you are not having to talk the lanyard it convenient and keeps it from falling on the groundc if it were to slip from your mouth it is comfortable to use as well and up definitely have a sore jaw after good product