Learn Spanish (Latin America): Abre la mandíbula suavemente nomás.

In Latin American Spanish, adding nomás after an imperative softens the instruction and makes it feel encouraging. It acts as an attenuator, meaning it makes the command less forceful. Instead of a strict "open your jaw," it feels more supportive, like "just go ahead and open your jaw."

Why does the sentence use la mandíbula instead of tu mandíbula for "your jaw"?

Spanish routinely uses definite articles (el, la, los, las) for body parts rather than possessive adjectives like tu or mi, as long as the owner is clear from the context. Because the verb abre is a command directed at you, it is already obvious whose jaw is being opened.

Can nomás be placed before the verb instead of at the end?

No, when used to soften a command or offer encouragement, nomás is a post-verbal particle, meaning it must come after the verb. It often sits at the very end of the sentence. Placing it before the verb (nomás abre) would sound unnatural in this context or could mean "as soon as you open."

Could I use the adjective suave instead of the adverb suavemente here?