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BigH
They ain't broken teeth, they're to aid shifting, it's pretty hard to tell if a cassette is too worn by eye unless it's really fucked and obvious, best way (if you haven't got the tool that I've never actually seen anyone have IRL) is to either measure the chain that's been used with it or if that's not an option try riding it with a new chain and put some force through every gear in the smallest chainring at the front against the brakes, no skipping then all good.