Class 1 bite: the ideal bite! The lower first molar is in front of the upper first molar Class 2 bite: the lower first molar is behind the upper molar. Usually will see an overbite or Overjet with this Class 3 bite: the lower first molar is ahead of the upper molar more than normal. This is where you see an underbite #underbite #invisalign #overbite #braces