I have the chainring shown below. It's the front sprocket of an ebike. Does this chainring need replacing or are the teeth still OK?
Shows some wear, but looks OK.
All teeth look symmetrical and so do the spaces between them. Really worn teeth look like a swept back shark dorsal fin or develop a visible burr.
Do a Google image search for 'worn chainring teeth' and you'll get plenty of examples.
Although the texture appears to be rusted/worn, the actual chainring itself seems to be okay. As someone said, the teeth are symmetrical as are the spaces in between each one. If this is the case, then you should be all good.