In fact, during the transition from deciduous, or milk, teeth to permanent teeth, the permanent teeth toward the front of the mouth often tend to crowd, since these are larger than the teeth they replace.
लेकिन, अस्थायी दाढ़ गिरने के बाद जब बदले में स्थायी द्विमूल दाँत निकलते हैं तो दाँतों की अपेक्षाकृत स्थिति में बदलाव होता है ।