Which of these teeth do not have a furcation on the mesial?

Name: Which of these teeth do not have a furcation on the mesial?
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Question

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The maxillary second premolars are single-rooted teeth and do not have any furcations. A bifurcated maxillary first premolar and maxillary molars all have furcations on the mesial surface because of their pattern of root location; facial and lingual on the maxillary first premolars and mesiobuccal, lingual, and distobuccal on the maxillary molars.

Which of These Teeth Do Not Have a Furcation on the Mesial