Stock mouthguards are pre-formed dental protectors designed to fit over the teeth. They are typically made from rubber or plastic and come in various sizes, but they are not custom-fitted. This means they may not provide the best comfort or protection compared to other types of mouthguards. These mouthguards are commonly used in sports like football, basketball, and boxing to help prevent dental injuries. They are readily available at sporting goods stores and are often the most affordable option for athletes looking to safeguard their teeth during physical activities.