German · Pronunciation Guide
dee TSAHN-buer-stuh. A compound: z is 'ts', the a is long, and the st in Bürste is a plain st rather than 'sht'.
The first element, ZAHN-, takes the primary beat with Bürste following more quietly — the invariable German compound pattern. The plural Zahnbürsten adds a syllabic n at the very end and disturbs nothing, since the ending was already unstressed.
Listen: die Zahnbürste
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Meine Zahnbürste ist blau.
My toothbrush is blue.
Listen: Meine Zahnbürste ist blau.
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Meine Zahnbürste ist blau closes on blau with its 'ow' diphthong. The noun itself is a good test: it needs a 'ts', a long a, a silent h, a short front-rounded ü, a darkening r and a plain st, all before the sentence even reaches its verb.
The st inside Bürste is the trap for anyone who has learned the 'sht' rule: it applies at the start of a word or stem, and here the s closes one syllable while the t opens the next. Say 'BUER-stuh', not 'BUER-shtuh'. The z at the front is the other correction, and it is always 'ts'.