I purchased this on Amazon for around $25 on sale after my dentist advised me to get a night guard. She wanted me to try drug store options to see if it worked, if it didn't she would have fitted me for one of the expensive ones. Well, it worked. My teeth are not as sensitive. I clench and grind my teeth when I'm stressed, when my allergies flare up, and when I'm having sinus issues. Purchasing this was a saving grace!!! I have bite marks in the guard, as I have been under a ton of stress, but it is better than my teeth taking the brunt of it. I would advise anyone with a night guard to purchase retainer cleaners so your guard gets a good cleaning. Follow the instructions given in the box to get a good fit. You may need to trim a bit off of the end to get a good fit.