# Upper lips do not attach to the jaw top controller

**URL:** <https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71>\
**Category:** Face Rigging\
**Created:** [March 6, 2026, 10:12am UTC](https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71 "2026-03-06T10:12:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![arnout](https://avatars.discourse-cdn.com/v4/letter/a/a587f6/32.png) [@arnout](https://kangaroobuilder.discourse.group/u/arnout)\
**Post date:** [March 6, 2026, 10:12am UTC](https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71/1 "2026-03-06T10:12:54Z")

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I’m using the mouth splines. The bottom lips attach to the jaw movement. But I do not seem to get the same behaviour with the jawTop controller and the up lips. Is this intended or do I miss a setting.

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**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\
**Post date:** [March 6, 2026, 10:21am UTC](https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71/2 "2026-03-06T10:21:22Z")

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What do you mean by the jawTop ctrl? Is that something you added?

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**Author:** ![arnout](https://avatars.discourse-cdn.com/v4/letter/a/a587f6/32.png) [@arnout](https://kangaroobuilder.discourse.group/u/arnout)\
**Post date:** [March 6, 2026, 10:25am UTC](https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71/3 "2026-03-06T10:25:24Z")

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It is a template part that comes with the bird rig, probably a duplicate of the regular jaw upside down. So I suppose usually lips don’t get attached to it. How would you go about connecting something like that?

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**Author:** ![ThomasBittner](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@ThomasBittner](https://kangaroobuilder.discourse.group/u/ThomasBittner)\
**Post date:** [March 6, 2026, 10:33am UTC](https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71/4 "2026-03-06T10:33:03Z")

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Ah, yeah the bird rig.

Unfortunately no, that has always been a limitation.

the way i usually solved it is with a tweaker ctrl in a post skincluster. Or the faceBend ctrls can do that behaviour, too.

When i had a wolf with a long nose that really needed an fk in the upper mouth, i avoided the splines in the mouth rig and solved it with blendshapes

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**Author:** ![arnout](https://avatars.discourse-cdn.com/v4/letter/a/a587f6/32.png) [@arnout](https://kangaroobuilder.discourse.group/u/arnout)\
**Post date:** [March 6, 2026, 10:36am UTC](https://kangaroobuilder.discourse.group/t/upper-lips-do-not-attach-to-the-jaw-top-controller/71/5 "2026-03-06T10:36:47Z")

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Alright, I might see if it’s doable with a custom Python script to attach the lip splines to the jaw Top.

Thanks for your answer, Thomas!