OK, I'm sure it's different every application cycle, but only 7/100 people out of my class came from the alternate list last year. This means two things. First, people that decided to come to Nova seldomly changes their minds and second, Nova hardly taps into the alternate list to fill entering classes.
Last year, there were 100s of people on our alternate list so you go figure the odds of coming off.
Further, current incoming class is very close being filled (last time I checked, two weeks ago, over 80/100 seats were secured) and Su-Ann also told me that this year applicants are committing to Nova a lot sooner than last year's applicants.
I guess things can always change even 1 week into the next school year, but Nova is not one of those dental schools that takes a lot of their incoming class from their alternate list like some dental schools.
Nonetheless, hang in tight and good luck in your application for admission.