Ég bursta tennurnar áður en ég fer að sofa.

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Breakdown of Ég bursta tennurnar áður en ég fer að sofa.

• áður en: before
• bursta: to brush
• tönnin: the tooth

Questions & Answers about Ég bursta tennurnar áður en ég fer að sofa.

Why does the sentence use Ég bursta (present tense)? Isn’t this about a future action “before I go to sleep”?

Icelandic commonly uses the present tense for habits/routines and also for actions that are generally true in a repeated context.
So Ég bursta tennurnar áður en ég fer að sofa is naturally understood as “I brush my teeth before I go to sleep (as a routine)”.
If you wanted to stress “tonight / in the future”, you’d usually add a time word (e.g. í kvöld) rather than switching tense.

Why is it tennurnar and not tennur?

Tennurnar is definite: “the teeth” (specifically your teeth in this context).
tennur is indefinite: “(some) teeth / teeth in general”, which sounds odd for the routine of brushing your own teeth.
So Icelandic typically says bursta tennurnar where English uses my teeth.

Where is the word for my? Why isn’t it tönnurnar mínar?