Are you sure it's a molar you are talking about? They're the teeth on the side of your mouth - not located on the 'front' as mentioned in your answer.
If that's not possible - then there may be some sort of dental filler you could apply yourself to cover over any jagged edges, but I wouldn't worry too much about reattaching the broken piece.
On a sidenote... If you're worried about people noticing your broken tooth, you could always employ a "distraction technique" to draw attention away from your broken molar.
