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I've always been curious about this. It is mentioned that fusion using the
Potara earings will keep you fused forever. So why did Vegito split inside
Buu's body? I remember Goku and Vegeta saying they were glad they split, but I
don't recall them explaining how it happened.


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2015-08-29T20:51:21.403
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2020-09-11T15:36:36.513
2016-01-13T10:42:13.113
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question
dragon-ball-z
Was it ever explained why Vegito split back into Goku and Vegeta in Buu's body?


The reason behind the splitting back was never explained in the anime.

In episode 273, _The Innards Of Buu_ , after Goku and Vegeta splits back into
their former selves, Goku asks:

> "Why'd we separate once we let the barrier down?"

To which, Vegeta has no idea about.

In the original manga, however, Goku tells that it must have been the "bad
air" inside Buu.

This was confirmed in the Daizenshuu.

Daizenshuu 4, pg 163, entry for Potara Earrings:

> Special Characteristics: To use them, the two people who will merge simply
> each take one of the two earrings and put in on their left or right ear,
> respectively. Furthermore, after merging the power is greater than with
> Fusion. However, the two people will automatically merge as soon as the
> earrings are put on, and in principle will be unable to ever split up again,
> so caution is needed when handling them. **The merged person will only split
> up when touched by the air inside Majin Buu’s body**. Also, while with
> Fusion the post-merged clothing is the native dress of the people of Planet
> Metamor, when merging with the Potara not only are the two people’s bodies
> mixed together, but their clothing is as well. In addition, pathetically
> enough the East Kaioshin and his attendant Kibito merged together without
> knowing a thing about Potara fusion.

* * *

**UPDATE:**

According to [Episode 66 of Dragon Ball
Super](http://dragonball.wikia.com/wiki/The_Climactic_Battle!_The_Miraculous_Power_of_a_Relentless_Warrior!),
the official explanation as to why the splitting occured, is given by Gowasu:

> Goku asks Gowasu how come he and Vegeta split before when he was told the
> effects of Potara are permanent, and Gowasu explains that **those who fuse
> that are not Supreme Kai will only stay fused for one hour**.


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2015-08-30T00:16:10.290
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2016-12-28T03:43:49.530
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answer


The reason they split was never explained in the original "Dragon Ball Z" but
it was explained in the new series "Dragon Ball Super" where it is explained
that the fusion is forever only if one of the two people fusing is a Kai.


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