Are all 3 grammatically correct?

I know it is correct to say: She isn't worth getting fired over.

I used the above construction and came up with the first 2 sentences. Are they correct? Is 3 correct too?

1 A piece of candy isn't worth having to brush my teeth over.
2 A piece of candy isn't worth brushing my teeth over a second time.
3 It's not woth brushing my teeth a second time for a piece of candy.

Thank you in advance