Something on my upper tooth just fell off while I'm brushing, I have had more braces for more than 2 weeks

I have had my braces for more than 2 weeks, and the "thing" i don't know what you call that, but its on my upper tooth and my ortho said it'll prevent me to bite the brackets and to pull out my upper tooth. Just fell off while i'm brushing. What should i do? Pleaase help

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