The GDC in April published its Student Fitness to Practice guidance.
The document covers:
(a) the types of professional behaviour and health standards expected of dental students;
(b) how fitness to practise can affect registration with us;
(c) when and how to make decisions about fitness to practise; and
(d) the key elements in student fitness to practise procedures.
Essentially students are treated very similarly to qualified dentists. I think this is sensible - and most students uphold these high standards already. Nonetheless, it's worth having a look at so you're familiar with what the GDC expects.