Try NAC, seriously. It's the only thing that worked for me and this is coming from someone that will bite off acrylics. https://www.today.com/health/how-stop-n

Try NAC, seriously. It's the only thing that worked for me and this is coming from someone that will bite off acrylics. https://www.today.com/health/how-stop-nail-biting-supplement-n-acetyl-cysteine-potential-treatment-t206238 https://www.today.com/health/how-stop-nail-biting-supplement... If you have a poke on Google Scholar, you'll find the science is quite good on this one.