the night guard that I got through my dentist broke and I wanted an affordable replacement. I thought that I'd give The Doctor's Night Guard a try. You need to be careful when heating the product and molding it to your teeth in order to get a good fit. The product is said to last for at least 6 months based on how hard you grind your teeth. In March 2016, it was 1 year since I started using the night guard and I'm a hard grinder. I'm very pleased with this product.