“How would a behavioral psychologist treat nail biting?”

Behavioral therapy: Therapy can help release the shame and negative emotions that often accompany nail biting. It can also help increase awareness of the triggers and urges you feel. In some cases, habit-reversal training or hypnotherapy are effective.

We would use a therapy called behavioral modification

Hi, Thank you for your question. A behavioral psychologist would treat nail-biting with Cognitive-Behavior Therapy (CBT) and Acceptance and Commitment Therapy (ACT), as well as refer to a psychiatrist or medical professional for a medication evaluation. I hope this has been helpful!

There are many strategies and ways to work with this. A common strategy is to engage in competing behaviors. For example, if you find yourself nail biting during particular times such as while watching television or reading, you might try engaging in other activities that occupy your hands during those times such as knitting/crochet or playing with a fidget spinner. You could also wear Burt’s Bees gloves which is a thin pair of gloves that allows you to use your hands and also moisturizes simultaneously (we don't want to just put on regular gloves which may feel punitive).

See this link...
https://www.psychologytoday.com/us/conditions/onychophagia-nail-biting#:~:text=A%20specific%20form%20of%20therapy,)%2C%20and%20cultivating%20social%20support.