Update app.py

Update app description

app.py

@@ -252,9 +252,9 @@ class GradioInterface:
         {app_styles}
         <div class="app-header">
             <h1 class="app-title">AI Dentistry Application</h1>
-            <h2 class="app-subtitle">Model Selection and Image Processing</h2>
+            <h2 class="app-subtitle">Advancing Imaging and Clinical Transcription</h2>
             <p class="app-description">
-                This application allows you to select different models for dental image processing tasks.
+                This application demonstrates the use of AI in dentistry for calculus and caries classification, caries detection, and dental x-ray segmentation.
             </p>
         </div>
         """