If the orthodontic treatment has not finished for three years, either your oral condition is very complicated or the doctor has some technical problems. If the doctor is weak now, it is better to change to a regular place as soon as possible. Although orthodontics is harmless, long-term treatment is a kind of torture to people's body and mind, and it has no benefit at all. The most important thing is to find a regular dental expert.
The cost will definitely be higher than before, depending on the region, and the materials used range from five or six thousand to more than ten thousand.