Final answer:
The sentence that is NOT grammatically correct is: Quierome lavar los dientes. In Spanish, the reflexive pronoun 'me' must come before the verb when using reflexive verbs.
Step-by-step explanation:
The sentence that is NOT grammatically correct is: Quierome lavar los dientes.
In Spanish, when using reflexive verbs like 'lavarse' (to wash oneself), the reflexive pronoun ('me') must come before the verb. Therefore, the correct sentence would be 'Me quiero lavar los dientes', where the reflexive pronoun 'me' is placed before the verb 'quiero'.
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