Yeah I'd say that's a bit risky. Dental schools can legally discriminate against applicants with certain medical conditions if there is reason to believe that they won't be able to complete the program. Regardless of your specific condition and prognosis, "neurological disease" is not what an admissions office would want to hear. Even if it is not a psych/cognitive issue, they might wonder whether you have adequate fine motor control of your hands. It's not about what your current and future abilities actually are; it's that you'll be raising those questions. What you can do is discuss your relationship with your doctor without commenting on the specifics of the disease. Be as much of a descriptive story-teller as you can be, as long as you don't lead the admissions officers down the wrong direction.
I had a severe neurological condition when I was younger, and it is probably the biggest thing in my life that has shaped who I am and has allowed me to be resilient in the toughest situations. Yet, I didn't mention it on my application because I didn't want to give dental schools an unintended, wrong impression of my abilities. It was very difficult to keep quiet about it, but ultimately I was glad I didn't say anything. Again, this is just my personal opinion, though.
