In a fully erupted tooth with a healthy periodontium, the apical end of the junctional epithelium is located
    
      
        
          
          at the cemento-enamel junction
        
      
      
      
    
      
        
          
          in the cervical third of the crown.
      
      
      
    
      
        
          
          1.5mm below the cemento-enamel junction.
      
      
      
    
      
        
          
          in the cervical third of the root.
      
      
      
    
    
    
    
    
    
    
    
  
  
 
              
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