Learn Farsi: من خودم را در آینه می‌بینم و مسواک می‌زنم. - I see myself in the mirror and brush my teeth.

It combines the reflexive word خود (self) with the first-person singular possessive ending م (my). Together they form 'my self', which Farsi uses just like the English reflexive pronoun 'myself'.

Why is there a را after خودم?

را is the specific direct object marker. Because خودم receives the action of the verb می‌بینم (I see) and refers to a highly specific person (you), it must be followed by را.

The English translation says 'my teeth', but I only see مسواک می‌زنم in the Farsi sentence. Where did 'my teeth' go?

Farsi does not require you to explicitly say 'my teeth' here. The compound verb مسواک زدن literally means 'to strike a toothbrush'. When you conjugate it with the 'I' ending as مسواک می‌زنم, it is naturally understood from context that you are brushing your own teeth.

I see می‌بینم uses the root بین. Is this an irregular present stem?

Yes. The infinitive for 'to see' is دیدن. Its present stem is بین, which is irregular and simply has to be memorized. By adding the continuous prefix می and the personal ending م, you get می‌بینم.