Can I be a dentist without an a level in chemistry?

Hi
just finished my gcse's and got a's and b's
I'm really keen on becoming a dentist and with the research I have done it says that you need an
A- in chemistry and an A - in biology
at gcse I eased through biology and got an a* and I'm definately taking it as an a level
but in chemistry I scraped a B and I'm unsure taking it as an a level.

I've spoken to some dentists and they have told me that there is a course at uni which only requires one science. But it means an extra yr at uni.

Is this true? And if I were to take this what subjects would you recomend?

Also what grades would be required to take this course?

Thanks
plz help