Are you talking about the metal bracket? This problem lasted for a long time. The technology and technology at that time were generally metal. Now, Invisalign has more ceramics, single crystals and angels of the times. The follow-up time is long, so it is less troublesome, almost transparent and comfortable. There is also a single crystal combined with Invisalign, the correction time is generally 1.5 -3 years, and an appliance is needed after correction. Some people need to have their teeth pulled out and feel uncomfortable for a week or two after completion. Pretty good. In order to become beautiful, this difficulty is easily overcome, and nothing else is a problem after the decision. If recommended, I personally think we should choose a well-known local dental clinic. There is a specialization in the art, and I have done a lot of homework before I do it myself. After grinding for two years, my friend introduced me to the medical beauty oral cavity. After I did it, I felt that the problems I had struggled with before were all my own. Come on, I must do it as soon as possible, otherwise the work is uncertain, the family has to take care of it, and there are many external factors, so it is difficult for you to make up your mind.