If you have diabetes, you’ll want to plan ahead before any major dental work. Talk with your doctor and dentist before the visit about the best way to take care of your blood glucose during dental work.
You may be taking a diabetes medicine that can cause low blood glucose, also called hypoglycemia. If you take insulin or other diabetes medicines, take them and eat as usual before visiting the dentist. You may need to bring your diabetes medicines and food with you to the dentist’s office. You may need to postpone any non-emergency dental work if your blood glucose is not under control.
If you feel nervous about visiting the dentist, tell your dentist and the staff about your feelings. Your dentist can adapt the treatment to your needs.
Source: National Institute of Diabetes and Digestive and Kidney Diseases