I read really good reviews for this product and that is why I purchased, however for me...it did not work, no matter how many times I tried to refit, the same outcome: buck teeth. I think like other people have commented, I got a production flaw, must have because other 5 star comments say it's a great fit. I cannot recommend this product and advise to proceed with caution. Main problem is if they do not work for you, there is no refund process and you are out the $200. Hard lesson learned.