First of all, the deviation of the midline refers to the normal occlusion (which can be understood as the best way to eat) and the vertical relationship between the lip line and people. After occlusion, if the upper and lower flosses are not aligned with the lip line, it can be understood as deviation.

Secondly. Should I correct it again? I will give you the following criteria:

1. Is it just a midline offset rather than an offset (you can only eat with one tooth, but not with two teeth at the same time)?

2. Everyone, when looking at their own midline, will be biased by factors such as perspective and mind. Lip line, tooth center line In general, the average person will not try to be perfect, and 2mm can be ignored.

3. Re-correction is time-consuming and laborious, which will have an impact on energy and health. There are many examples of correcting failures. There is still some damage to the teeth.

As for the consideration of profit and loss, it's up to you. Personally, as a patient who has been corrected twice, I suggest you not to do it again.