Over-the-counter mouthguards, like boil-and-bite mouthguards and stock mouthguards, come in generic one-size-fits-all styles. They can be purchased at most drug stores and sporting goods stores. In contrast, custom mouthguards are created by your dentist from dental impressions. They are custom-made to fit your teeth and mouth. Due to their suction, custom mouthguards will not fall out since they will stay in place. Keeping the mouthguard in place using your tongue or lips isn’t necessary. Over-the-counter mouthguards may cost less. However, they do not cover the teeth and gums enough and do not have the suction effect. Since over-the-counter mouthguards aren’t custom-fitted, they are bulky and uncomfortable. In addition to their superior protection, custom mouthguards fit better and allow you to speak comfortably. They also do not make breathing difficult. Since they fit more comfortably and can be tailored to fit specific conditions, custom mouthguards or night guards can also be used to treat bruxism, sleep apnea, and snoring. An over-the-counter mouthguard is meant mainly for sports and is not recommended for bruxism, sleep apnea, or snoring. A night guard serves a different purpose. It is designed differently from what you would wear for sports. Wearing an improper mouthguard can lead to injury.