With no explanation, label text_A→text_B with either "entailment" or "not-entailment".
text_A: Tim's tooth was hurting like crazy. He could barely eat or drink. His dentist took a look around in his mouth. One of his teeth was rotten. "Once the tooth was pulled, Tim felt fine."
text_B: The dentist explained the problem to Tim. starts before he took a look around in Tim's mouth
not-entailment.