infradentale
noun
                                                                                                                            
                                                            in·fra·den·ta·le
                    
                                                                                                              
                                                                                                                                  ˌin-frə-den-ˈtā-lē 
                                                      
                                                          
            
                                
              
          
                                                      : the highest point of the gum between the two central incisors of the lower jaw                                      
                
                    
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  Merriam-Webster unabridged




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