I am 4 months into braces and they just changed my top wire to the last steel wire. Is this to soon for the steel wire?

I have had braces for 4 months now. My top teeth are in the last steel wire already. Is this ok? There is no more rotations for the top- just a few minor adjustments that need to be made for more straightened teeth. They tell me I will be in this wire the rest of my treatment which they estimated about 18 months. Once my lower can get into a stronger wire I will start my bands to adjust my bite.

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