This is the 17826th most frequent Polish word.
zêby
The Polish word "zęby" means "teeth" in English.
'Zęby' here depends on the noun 'musisz umyć' and refers to the teeth as the subject.
Musisz umyć swoje zęby po każdym posiłku.
You should brush your teeth after every meal.
'Żeby' here introduces an infinitive clause expressing purpose.
Muszę zapisać się do dentysty, żeby zbadać swoje zęby.
I need to make an appointment with the dentist to check my teeth.
'Żeby' used here means 'so that' and forms a purpose clause.