With the advancement of dental technology, more and more people are choosing orthodontics to improve their misaligned teeth. One of the most popular is invisible orthodontics, which uses clear retainers to straighten teeth without the knowledge of others. Let’s take a look at how effective clear retainers are. Generally speaking, clear retainers are simple to make and comfortable to wear. Compared to traditional retainers, they are effective in maintaining the length and width of the dental arch and are more effective for reversing teeth. With traditional retainers, it is possible to adjust the teeth within certain limits, such as the closure of small gaps. There are many claims that clear retainers do not have significant clinical differences compared to traditional retainers. Clear retainers are particularly effective for patients with open and deep overlays, especially open, because for deep overlays we can also use retainers with flat guides. The biggest advantage of clear retainers is that they are aesthetically pleasing, but they are very easy to stain, so it is often important to explain to patients that they should not drink colored beverages such as tea, coffee, or orange juice with retainers. It seems that cases with very swollen gums at the end of orthodontic treatment are not suitable for clear retainers. Those with very small teeth are also not indications. Some people wear them to cause the front teeth to open and close, even larger than the resting gap, which can be detrimental to the joint. With a normal retainer, it is only possible to control the labial and lingual orientation, but not the vertical orientation, and it is rare to wear it beyond the resting position. Therefore, this type of retainer is significantly better than the Holley retainer for open and closed control. Patients with a tendency to open and close should try not to grind the posterior teeth, especially not through, otherwise there will be no control of the posterior teeth in the vertical direction. For those who have deep overlap, it is possible to grind the posterior facets through and allow the posterior teeth to be elevated. The above describes the efficacy of clear retainers. The use of clear retainers has met the aesthetic requirements of aesthetic lovers and has made invisible orthodontic technology very popular.