Black dots and lines on chewing surfaces may be normal as stains. But need to be checked clinically. If they are on other surfaces, then there may be some problem like cavities.
It may be cavities or it may be stains. Can only be confirmed after seeing the image or examining the tooth by the dentist
if the dots and lines which you are saying appears to be deep it may be cavities. Which will need to be filled up.
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