English Translation
Biting your fingernails is a bad habit.
If it is “biting” rather than “chewing” - “Nägelbeißen” rather than “Nägelkauen”?
Literally, yes. But in english “biting” is the word to use, and in german it’s “kauen” 
Biting your fingernails is a bad habit.
If it is “biting” rather than “chewing” - “Nägelbeißen” rather than “Nägelkauen”?
Literally, yes. But in english “biting” is the word to use, and in german it’s “kauen”