Mavala Stop - Helps Cure Nail Biting and Thumb Sucking, 0.3-Fluid Ounce (Health and Beauty)

Used this on my son for nail biting, it took 2 applications before it worked. The bitter taste completely killed his needs to bite on his nails.

 

https://www.amazon.com/Mavala-Stop-Biting-Sucking-0-3-Fluid/dp/B0000YUXI0/ref=cm_rdp_product