Question

your friend is sharing the advice she received from her dentist: ¡no vas a creer lo que mi dentista me sugirió! ¡masticar chicle! pues, me dijo que una investigación reciente demostró algo inesperado: masticar chicle durante 20 minutos después de cada comida estimula la producción de saliva que se necesita para neutralizar la formación de sarro. ¿no es increíble? eso sí—y esto es muy importante—no mastiques chicle azucarado... porque sería una invitación a las caries. what did the dentist recommend?
○ come back in two weeks
○ chew sugar - free gum after meals
○ use mouthwash regularly
○ brush with an electric toothbrush

Explanation:

The text is about a friend sharing dental advice from their dentist. The key part is "masticar chicle después de cada comida" (chew gum after meals) with the note of "sugar - free" (since it also says "no mastiques chicle azucarado" - don't chew sugared gum). Among the options, "chew sugar - free gum after meals" matches the dentist's recommendation. The other options: "come back in two weeks" isn't about a daily/meal - time recommendation, "use mouthwash regularly" and "brush with an electric toothbrush" aren't mentioned in the advice about chewing gum after meals.

Answer:

chew sugar - free gum after meals