So not to be a Debbie downer but every medical person I have heard/seen comment on mouth taping thinks it is a bad idea, the majority opine that it is downright dangerous, particularly for anyone with lung disease. If the doctor of anyone in this group says something different I would be interested in hearing that. I know many love the Breath book but it reads like pseudoscience to me and I would be cautious in evaluating its content. I have read comments by medical professionals whose opinion is that the author misquotes or improperly summarizes the research cited. If mouth taping is working for you, make sure you discuss the practice with your medical team. I am not saying Breath or any other self-help resources cannot be helpful. But be sure to review the information you find of interest with your medical team to make sure you are all on the same page, or at the very least that you are fully informed. My dentist agrees mouth breathing is not a great practice but recommended expanding my palate to improve my nose breathing which at my age would be really involved and seemed kinda crazy when he made the recommendation (which was before my BE/MAC diagnosis).