Dentists will do all they can to help put your mind at rest if you're nervous or anxious about treatment.
First of all, talk to your dentist about your concerns. They will be able to explain the treatments and what each of the instruments does. They might also have 'diversions' - a fish tank, background music, even videos - to take your mind off your treatment.
As well as listening to your concerns, dentists can offer more practical solutions too. Some dentists offer something called conscious sedation, where you stay awake but special drugs mean that your anxiety levels are lowered. Other practices offer hypnosis or acupuncture either to get you over your fears or to distract you from them. If your anxiety is severe, you may want to consider specialist counselling or anxiety management courses.
If you're worried that your treatment might be painful, talk to your dentist about pain relief, either conscious sedation or local anaesthetic.