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retainer
mastery UK /ɹɪˈteɪn.ə/ US /ɹɪˈteɪn.ɚ/noun
card 1 of 4 · fill in the blank
After getting her braces off, she wears a _____ retainer at night.
card 1 of 4 · fill in the blank
After getting her braces off, she wears a _____ retainer at night.