80147
I would like to know what does 歯が欠ける mean: Lacking teeth? Broken teeth?

Context: 人の幸せを素直に喜べないやつ理解出来なさすぎて、また歯が欠けた。

My translation:

I can't barely understand people who cannot honestly be glad for other's
happiness, 「???」.

How would you translate the expression 歯が欠ける?

Thank you so much in advance for your help!
CC BY-SA 4.0
2020-08-14T15:38:21.850
80136
2020-08-14T22:54:05.183
29677
question
words expressions
What does 歯が欠ける mean?
This is not an idiom, and また歯が欠けた means "my tooth was chipped again (because I
clenched my theeth)". Although I haven't seen something like this before, I
can imagine this person said this to express his uncontrollable frustration.
Perhaps this is an exaggerated joke, and he did not chipped his tooth in
reality.
CC BY-SA 4.0
2020-08-14T22:54:05.183
80147
2020-08-14T22:54:05.183
5010
80136
answer