Now many patients in the end of orthodontic treatment for aesthetic purposes often want to choose to wear transparent orthodontic retainers, and even some doctors will recommend transparent retainers, that transparent retainers are both beautiful and lightweight, in fact, there is a misunderstanding here. Transparent retainers are also known as transparent pressure film molding retainers, belonging to the popularity of the retainers in recent years, it was first used as teeth bleaching trays in dental applications, due to the thin and transparent characteristics of the main protagonist of the induction technology, but also logically used as a transparent orthodontic retainers. Due to the pressure film transparent retainers wrapped around the teeth in all directions, blocking the normal salivary buffer on the surface of the teeth and remineralization function, the teeth for a long time sealed under the film, the surface of the teeth to form a local acidic environment. This causes demineralization of the enamel layer on the surface of the teeth, which further produces dental caries. In addition, after the end of orthodontic treatment, the occlusal surfaces of the upper and lower teeth also need to achieve a period of occlusal wear to achieve a close occlusal contact, so as to achieve the maximum occlusal chewing function, while the transparent pressure film retainer blocks the occlusal surfaces of the upper and lower jaw teeth contact wear, which affects the long-term stability of the dental contact, which also weakened the efficacy of the orthodontic retainer, and the last point, many doctors tend to require the patient to wear a transparent pressure film retainer when they eat. Lastly, many doctors require patients to wear a clear pressure film retainer while eating, which results in an elevated occlusal surface and premature contact points that can lead to dental trauma and TMJ injuries. Therefore, the traditional Hare’s retainer should be the retainer of choice at this time, whereas the clear orthodontic compression retainer is not suitable for long-term wear.