Binding of Isaac: Rebirth Wiki
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Monstro's Tooth is an activated item.

Effect[ | ]

  • A friendly Boss Monstro ingameMonstro jumps on a random enemy, dealing 120 damage while destroying nearby obstacles like rocks.

Notes[ | ]

  • This item will target Isaac if it is used in a room without monsters and can cause damage.
    • Monstro can be dodged in multiple ways depending on Speed and timing.
      • (except in Repentance) At 1.95 Speed or higher, Monstro can be dodged by walking in a straight line.
      • (except in Repentance) At 1.84 Speed or higher, Monstro can be dodged by standing still for a moment, and then moving.
      • (except in Repentance) At 1.69 Speed or higher, Monstro can be dodged by walking in one direction then walking in the opposite direction with the right timing.
      • (in Repentance) At 0.86 Speed or higher, Monstro can be dodged by walking in a straight line.
      • (in Repentance) At 0.62 Speed or higher, Monstro can be dodged by standing still for a moment, and then moving.
      • (in Repentance) At 0.38 Speed or higher, Monstro can be dodged by walking in one direction then walking in the opposite direction with the right timing.
  • Monstro will target ShopkeeperShopkeepers. In Repentance you can also bait him into opening secret rooms or destroying tinted rock without hurting Isaac, if timed correctly. Pre-Repentance Monstro will home in on Isaac and hit him no matter what.
  • If Monstro falls near the entrance to a Secret RoomSecret Room, it will be opened. This can be used to open Secret RoomSecret Rooms without using BombBombs.
  • (except in Repentance) Like Boss Mom ingameMom and Boss Satan ingameSatan's stomp attacks, this attack is treated as an explosion, so Collectible Pyromaniac iconPyromaniac and (except in Rebirth)Collectible Host Hat iconHost Hat will be activated if Monstro falls on Isaac.
  • (in Rebirth) This item does not affect the boss, Boss Monstro ingameMonstro.

Synergies[ | ]

  • (in Repentance)Collectible Book of Virtues iconBook of Virtues: Spawns wisps in the middle ring, looking like teeth. These wisps shoot 50% slower than the average wisp, but deal 12 damage per shot.
  • (except in Rebirth)Collectible Car Battery iconCar Battery: Monstro deals double damage.

In-game Footage[ | ]

Gallery[ | ]

Trivia[ | ]

  • The tooth can be seen missing in Boss Monstro ingameMonstro/ Boss Monstro II ingameMonstro II's mouth.
  • This item is similar to II - The High PriestessII - The High Priestess, but deals less damage.
  • Judging by the sprites of Monstro/Monstro II, it can be assumed that the missing tooth is an incisor tooth or canine tooth. The item physically resembles a molar tooth however.
  • This item's unlock is the most common steam achievement in the game.


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