Thumb sucking

Kaila • Baby #1 Sophia 4/19/19🌸🎀

My daughter just turned 2 and her dentist told me she needs to stop sucking her thumb. She only does it when she is taking a nap or going to sleep to soothe herself to sleep. I was wondering if there’s any good methods or products to use? I have searched ways to stop it and putting things like acetone on her thumb doesn’t seem like a safe/good method