-they brushed
The word cepillaron is the preterite form of cepillar in the third person plural.
See the full cepillar conjugation


¿Se cepillaron los dientes?
Have you brushed your teeth?
¿Todos se cepillaron los dientes?
Everyone brush your teeth?
Sé que todos hoy se levantaron y se cepillaron los dientes. Eso espero.
I know that you all wake up on the morning and brush your teeth... hopefully.
Chicos, ¿ya se cepillaron los dientes? Sí.
Did you guys brush your teeth? Yes.
Si se cepillaron las cámaras, saben lo que están haciendo.
If they took out the cameras, they know what they're doing.
Me cepillaron el cabello.
They brushed my hair.
¿Se cepillaron los dientes, chicos? - Sí, mamá. Nos cepillamos los dientes y nos limpiamos con seda dental.
Did you brush your teeth, boys? - Yes, Mom. We brushed our teeth and flossed.
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