Learn Hardcore French: Je me couche après que je me suis brossé les dents. - I go to bed after I have brushed my teeth.

Because après que situates a real, completed event in time. Standard French requires the indicative after après que: après que je me suis brossé les dents. You may hear the subjunctive (après que je me sois brossé) in speech, but it’s considered incorrect in careful usage. Contrast: avant que takes the subjunctive (for example, avant que je me brosse les dents).

Is there a smoother way to say this with après + infinitive?

Yes: Je me couche après m’être brossé les dents. This uses après + infinitif passé when the subject is the same in both actions. If the subject changes, keep après que with a finite verb: Je me couche après qu’il s’est brossé les dents.

Why is it les dents instead of mes dents?

With reflexive verbs and body parts, French normally uses the definite article: se brosser les dents, se laver les mains. The reflexive pronoun already shows whose body part it is. Use a possessive only for emphasis or to avoid ambiguity, or when it’s someone else’s body: Je lui brosse les dents (I brush his/her teeth).

Why is it brossé and not brossée if the speaker is a woman?

No agreement here. In se brosser les dents, the direct object is les dents, placed after the verb, and se is an indirect object. So the past participle stays invariable: Je me suis brossé les dents, whether the subject is male or female.

When would the past participle agree (be brossées)?

If the direct object comes before the participle. For example:

Je me les suis brossées. (les = les dents → feminine plural, so agreement)
Elles se les sont brossées. Also compare a verb without a direct object: Elles se sont couchées (agreement with the subject).

How do the reflexive pronouns work here, and where do they go?

Reflexive pronouns precede the verb (or the auxiliary in compound tenses):

Present: je me couche, tu te couches
Passé composé: je me suis brossé, elle s’est brossé Negation wraps around the pronoun and auxiliary: Je ne me suis pas brossé les dents.

Is the mix of present and past tenses normal?

Yes. French marks relative time clearly:

Main in present, earlier action in passé composé: Je me couche après que je me suis brossé les dents.
Main in future, earlier action in future perfect: Je me coucherai après que je me serai brossé les dents.
Main in past, earlier action in plus-que-parfait: Je me suis couché après que je m’étais brossé les dents.

Can I just say puis or ensuite instead?

Absolutely: Je me brosse les dents, puis (ensuite) je me couche. That’s often the simplest way to express sequence.

Can I put the après que clause first?

Yes: Après que je me suis brossé les dents, je me couche. Likewise with the infinitive version: Après m’être brossé les dents, je me couche.

Can I use après without que before a full clause?

No. Après alone must be followed by a noun or an infinitive phrase:

Après le dîner, je me couche.
Après m’être brossé les dents, je me couche. Not: Après je me suis brossé…

Is se coucher the same as dormir?

No:

se coucher = to go to bed/lie down.
s’endormir = to fall asleep.
dormir = to sleep. So you usually te couches before you t’endors, and then you dors.

Why are there two me forms in the sentence?

Both verbs are reflexive: je me couche and je me suis brossé. Each reflexive verb needs its own reflexive pronoun matching the subject.

How do I say it with only/just?

Use ne… que: Je ne me couche qu’après m’être brossé les dents. This means I only go to bed after brushing my teeth.

Any quick pronunciation tips?

In m’être, the m’ links smoothly to être.
In je me suis, the sequence flows as one unit; don’t stress each word.
Final consonants are mostly silent: brossé ends with a silent é sound; dents ends with a nasal vowel, the t is silent.