Daniel:

Oh his insides did a whole flip. He seen many things but to watch a tooth fly by is something new. But made him furious as that not just any person's tooth, that's YOUR tooth!

UI came out. The fight was dealt with quick after that. The person had no more teeth left.

Zack:

He punched that person so hard in return that three teeth of theirs went flying. Zack would have gone for more but worry overtook so he rushed to you to gush, pushing tissues onto your mouth and urging you to press on it and go to the hospital, claming in his panic; "Maybe they can stitch it back on!" as if it's a cut off finger.

Jay:

He froze, stared at it, then picked it up, took out his wallet, and handed you the tooth with a shit ton of money as if to say 'go get it fixed' then he gently pushed you away.
He didn't show mercy to the person. He took the nearest object and used it to beat up the person until they would need to lay in a hospital for a while.

Vasco:

Fury. No one hurts his friends, less so his partner. But he wasn't gonna ruin someone's life either by breaking all their teeth. So he had a new plan.

He beat that person up until they were on their knees in front of you, crying out apologies and pleading for mercy, promising to pay for you to get it fixed.

Jace:

A lot of creeped out cursing, unsure what to do now, very sure he can't deal with this but he's ready to try to keep you safe and look admirable. But he doesn't want his teeth knocked out!

So he took your arm and nervously said you two should go, but you insisted on staying so both attacked at same time to get revenge.

Johan: (I STILL have no clue how to write for him T_T)

Great, now he has to raise money to fix your tooth... He picked up your tooth, telling the person; "I didn't want to fight you, but now I have to".

It was dealt with swiftly. When he was done he handed you the tooth, joking that you can put it under your pillow.

Jake:

"Hey, we match!" he joked despite his internal freaking out. Best not to panic you. And hey, it is true. He joked that it's at least one and not more, like he got. Then he complained of how expensive that was to fix and how he still plans to give Gun the same outcome.

Gun: (I just love how OP Gun is in the latest chapters, haha)

A sense of impressiveness towards the person for achieving that, and daring to do that to his partner. That person never spoke again as Gun ensured not a single tooth would be left. Some claim he made the person even swallow their own teeth.

Goo:

He went silent, taken back they landed that hit. This felt like a personal attack to him. He let his partner's tooth get knocked out. Slowly his dark look turned to slow laughs, walking away. He returned with a metal pipe he found nearby, which he then used to put that person in their place. Their place? Six feet below the ground.

Taesoo:

His eyes widened then BAM! His fist already flew out then BAM! His other fist. Fuck any rules or image, this requires immediate taking care of and teaching. Once he was done he cupped your face to check the spot out then assured can get that taken care of.

Jichang:

The side of his hand hit the person's neck; knocking them right out. He examined your mouth, complaining in grumbles then took you to the dentist immediately. He used his status as cop to get ahead on the list. As you were at the dentist he returned to the person to get demand some stuff, like why they did it, who send them, etc.

Seongji:

His eyes widened, surprised by this outcome, then he pushed you behind him and BAM BAM! Combo hit the person so they fell right to the ground. Carefully he cupped your cheek, asking if you're okay then apologized.

He's not even sure why he is, but a sense of guilt came as he let that happen when he, your boyfriend, is right here. He wished he could do more but he can't so he just tried to give you stuff to ease any pain from it.