Avoid stimulant drinks
Onychophagia is related, in most cases, to anxiety, so products containing caffeine or substances that alter human behavior are not good allies. It is important to remember that on many occasions, nail bites occur in moments of emotion or nerves. Therefore, any drink similar to coffee or Coca Cola should be suppressed as they can increase those cases of anxiety or restlessness.
Seek other alternatives
Try to relate when you bite your nails to try to avoid them. If you do it when you’re really bored, avoid dead time and keep your hands busy, for example, take a crossword puzzle or a sudoku and eat your head while thinking of the solution, but don’t nibble on the pencil.