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Yes, maybe the chainring and cassette/cog too by the looks of it.
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Yarp!
As the pins and rollers wear the effective length of each link increases, so each roller is picked-up higher on the tooth and then slides down as the sprocket rotates: hence the characteristic "shark's tooth/wave" shape of worn teeth.
One of these is best, as it only measures the wear at one roller/pin, whereas the more common type measure it at two and will have you changing your chain too early.
But that's better than too late...
Hovis
Scilly.Suffolk
@bazschmaz
Is this chains inability to seat itself an indicator that it's time to replace it?
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