cepillarás
-you will brush
The word cepillarás is the future form of cepillar in the second person singular. There are other translations for this conjugation.
See the full cepillar conjugation

cepillar

Tú definitivamente te cepillarás los dientes.
You will be... you will definitely be brushing your teeth.
No. Y tú te los cepillarás también.
And you're gonna be brushing your teeth too.
Ya no cepillarás mi cabello.
But don't brush my hair any more.
Si no lo cepillaras tanto, no parecería tan usado.
If you didn't comb it so much it wouldn't look so used.
Quizá si te cepillaras los dientes de vez en cuando, esto no te supondría un problema.
Maybe if you brushed your teeth once in a while, this wouldn't be a problem.
Te dijeron que te cepillaras el diente, y como no lo hiciste, se te cayó.
They told you to brush your tooth. You didn't, it fell out!
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