My teeth are perfectly straight and I don't have an overbite. When will I get my braces off?

my teeth are perfectly straight and I don't have an overbite. I have had them on for 4 and a half months but they corrected my overbite in the first 2 months of the treatment and they are straight now. I only where elastics at night and I have chain elastics on my top 4 teeth. When will I get my braces off?! They are gonna get an x-ray of my roots next month.

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