Η οδοντίατρος μου λέει να βουρτσίζω τα δόντια μου τρεις φορές την ημέρα.

The dentist (female) tells me to brush my teeth three times a day.

Breakdown of Η οδοντίατρος μου λέει να βουρτσίζω τα δόντια μου τρεις φορές την ημέρα.

• να: to
• μου: my
• μου: me
• τρεις: three

Questions & Answers about Η οδοντίατρος μου λέει να βουρτσίζω τα δόντια μου τρεις φορές την ημέρα.

Why does it say Η οδοντίατρος with a feminine article η, even though οδοντίατρος ends in -ος, which I thought was masculine?

In Greek, the ending -ος is usually masculine, but not always. Some professions and a few other nouns can be “common gender”: they keep the same form, and the article shows the gender.

• ο οδοντίατρος = the (male) dentist
• η οδοντίατρος = the (female) dentist

The noun οδοντίατρος itself does not change; you change only the article (and any adjectives) to show whether the person is male or female.

So η οδοντίατρος here means “the (female) dentist.” If it were a male dentist, the sentence would be:

• Ο οδοντίατρος μου λέει να βουρτσίζω…

Why is it Η οδοντίατρος μου and not μου η οδοντίατρος or η δική μου οδοντίατρος?

The little word μου is a weak (clitic) pronoun meaning “my / to me.” In Greek, these weak pronouns normally go after the noun they belong to:

• η οδοντίατρος μου = my dentist
• το βιβλίο μου = my book
• η αδελφή μου = my sister

You can say η δική μου οδοντίατρος, but it sounds like you are emphasizing “my (own) dentist” (for contrast: not someone else’s dentist). In normal, neutral speech η οδοντίατρος μου is the standard and most natural form.

Putting μου before the noun () is not natural modern Greek.