singular/plural

Question

In "ellos consiguen borrar los malos pensamientos de su cabeza," why is it not "de sus cabezas" since we said "ellos"?

Answer

Hola XoseIn Spanish we sometimes use the singular form and it's understood that we are referring to "each of their heads/minds" - we don't necessarily need the plural, while in English it would sound odd or incorrect to use it in singular. Saludos