Hi there,
I am currently a mentor and so hopefully can offer you some indication of what this involves.
Firstly, it is not a task to be taken lightly as it is very important to offer good structured feedback and be able to offer support guidance along side that of the dentists he/she will be working with.
You will need to take an online mentoring assessment which you need to pass in order to become a mentor through the local training centre to you.
As you have been qualified for 5 years you may already be familiar with the new style of questions for examination (MSQ) and the record of experience (which came in 2008 onwards).
The ROE is now done wholly online and the trainee will need to be supervised and supported through various tasks, taking her through preparation of the surgery, decontamination, disinfection of impressions, assistance with placing local anaesthetic, assisting with restorative procedures, XLA's and dentures among others.
The trainee will need time to complete the record of experience for these and will need you to go online and read through and offer advice, support and sign them off as competent when it is decided that they are.
Reflection, support and advice is the name of the game - I am sure you will really enjoy it : )
I hope this helped?
Good luck