My boyfriend fell over a table whilst inebriated and knocked his front tooth out. will it ever grow back?

No: If the whole tooth came out, no. If he broke the top portion off, maybe the remaining structure is enough to save with root canal, post and crown.

Tough Break: Your boyfriends tooth will not grow back. If this ever occurs again try and get the tooth in some milk and get ahold of a dentist to reinsert the tooth, a small percentage of the time, if reinserted very quickly this can re-attach and save the tooth. He will need to ask about either a partial denture, a fixed denture, or an implant to replace the tooth.