The correct sentence is: "Yo me cepillo los dientes cada mañana."
In this sentence:
- "cepillo" is the correct conjugation of the verb "cepillarse" (to brush) for the first person singular (yo).
- "me" is the reflexive pronoun that indicates that the action is being performed on oneself, so it means "I brush (myself) the teeth."
- "los dientes" means "the teeth."
- "cada mañana" means "every morning."