Final answer:
The correct answer is OD. se cepilla.
Step-by-step explanation:
The subject of the question is Spanish. The correct answer is OD. se cepilla.
The phrase 'se cepilla' means 'he/she brushes' in Spanish. Therefore, the sentence translates to 'The dentist brushes his/her teeth three times a day.'
It is important to note that 'se cepilla' is used when referring to the third person singular (he/she) in the present tense.
Learn more about Spanish verbs