The penultimate tooth in the upper row is extracted and has to be replaced. The penultimate tooth in the upper row is a first molar if there are no wisdom teeth, and a second molar if there are wisdom teeth, both of which are important chewing teeth and need to be restored in a timely manner. The reason for this is that the absence of this tooth will lead to tilting of the neighboring teeth or elongation of the mandibular teeth, which will lead to disorders in the occlusal relationship or food impaction and other adverse effects, so it is recommended to restore it. You should pay attention to oral hygiene after the tooth is extracted, avoid eating for 2 hours, after 4 hours, you can choose some light, soft and liquid diet, avoid brushing and rinsing for 24 hours, avoid taking too spicy, too acidic, too greasy and too hard ingredients for a week, mainly to prevent infection and bleeding. The penultimate tooth in the upper row is extracted, need to be in three months, the alveolar bone, gums fully recovered, before being able to install denture filling treatment.