A lot of schools are probably just starting. Secondaries are already on the way for some schools.
This is the way I think about your question: If the first date any dental school can accept you is Dec 1, then they will probably interview for the Dec 1 acceptance batch starting in October. That means that they'll have reviewed your app by then, meaning September/August timeframe.
But remember, it'll take AADSAS at least one month to process your application from the time you submit it.