So far, so good. After nearly 6 months of myofacial therapy and the Vivos dental device, my practitioner told me to start on this water bottle. I know it's a workout, and it is meant to be to strengthen the tongue and find correct mouth placement when resting. I will be using it a lot going forward to support my other treatment protocol and get off my CPAP machine for good! I appreciate the video info; it cleared up some questions about proper usage and tongue alignment. Thanks!