Antes da entrevista, o Pedro vai barbear-se e usar espuma nova.

Because da is the contraction of de + a.

• antes de = before
• a entrevista = the interview
• So antes da entrevista literally combines into before the interview

This kind of contraction is very common in Portuguese:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

If it were indefinite, you could say:

• antes de uma entrevista = before an interview

And before a verb, there is no article:

• antes de sair = before leaving

In European Portuguese, it is very common to use the definite article before a person’s name:

• o Pedro
• a Maria

This does not mean the Pedro in English. It is just a normal feature of the language, especially in everyday speech.

In Portugal, o Pedro sounds very natural. In some formal contexts, the article may be omitted, but in ordinary speech it is extremely common.

Vai barbear-se e usar... is the very common near future structure in Portuguese.

• vai = he goes / he is going
• barbear-se = to shave
• usar = to use

So vai barbear-se e usar espuma nova means he is going to shave and use new foam.

This is one of the most common ways to talk about the future in spoken Portuguese. It is often more natural in conversation than the simple future.

The -se is a reflexive pronoun. It shows that Pedro is doing the action to himself.

• barbear = to shave someone / to shave
• barbear-se = to shave oneself

So here, Pedro is shaving himself.

Compare:

• O barbeiro vai barbear o Pedro. = The barber is going to shave Pedro.
• O Pedro vai barbear-se. = Pedro is going to shave himself.

In European Portuguese, when this pronoun is attached to an infinitive, it is normally written with a hyphen:

• barbear-se

In European Portuguese, pronouns like me, te, se, o, a, lhe are often attached to the verb, especially with infinitives:

• barbear-se
• lavar-se
• vestir-se

This is very normal in Portugal.

So vai barbear-se is the expected pattern here: the future expression vai is followed by the infinitive, and the reflexive pronoun stays attached to that infinitive.

A learner coming from Brazilian Portuguese may expect different pronoun placement, but for Portugal, vai barbear-se is a very natural choice.

Yes. Vai governs both infinitives.

So this:

• o Pedro vai barbear-se e usar espuma nova

means the same as:

• o Pedro vai barbear-se e vai usar espuma nova

Portuguese often avoids repeating the auxiliary when the same subject is doing both actions. That makes the sentence more natural and less repetitive.

Literally, espuma just means foam.

But in this sentence, because the context is shaving, espuma is naturally understood as shaving foam.

If you want to be completely explicit, you can say:

• espuma de barbear = shaving foam

So:

• usar espuma nova is fine in context
• usar espuma de barbear nova is more specific

In Portuguese, adjectives often come after the noun.

So the neutral, ordinary order is:

• espuma nova = new foam

Also, nova must agree with espuma, which is feminine singular:

• espuma → feminine singular
• nova → feminine singular

You can sometimes put the adjective before the noun:

• nova espuma

But that usually sounds more stylistic, emphatic, or context-dependent. For a straightforward sentence, espuma nova is the most natural order.

It is completely correct and standard, and learners should understand it.

That said, in everyday European Portuguese, many people also say:

• fazer a barba = to shave one’s beard

So for a man shaving his face, you may often hear:

• O Pedro vai fazer a barba.

Compared with that, barbear-se can sound a little more neutral or slightly more formal/dictionary-like, but it is still perfectly good Portuguese.

Antes da entrevista is an introductory time phrase at the beginning of the sentence.

The comma helps separate that opening phrase from the main clause:

• Antes da entrevista, o Pedro vai...

This is very natural in writing. With a short opening phrase, the comma can sometimes be omitted:

• Antes da entrevista o Pedro vai...

So the comma here is mainly about clarity and style, not a change in meaning.