Ok so depends on the level of cover you choose how much money the fund will cover.
Ie. extras75 means they cover 75% of the bill if you go to a preferred supplier, extras85=85% etc.
Preferred providers means they will pay more of your bill than if you pick any random dentist.
For example I was getting acupuncture. I was only having to pay $15 for a session, whilst my mum who is with a different fund, and didn't recognize the acupuncturist as one of THEIR preferred providers, had to pay $50!

Does that make sense? I wouldn't think if you only want dental cover that it would be viable for you. If you use physio, optical etc then go for it.
Also, pretty sure most funds cover general dental checkups completely and then have an amount for general dental and surgery etc. depends what you want?