I am so sorry to hear about your experience. I cringed a little reading this - I am a dentist, and I am embarrassed by the way you were treated. Dentists learn a little about diabetes in dental school, but not a tremendous amount. I am a lot more knowledgeable on the subject since I married my (Type 1) husband, but I would never say the things this doctor did.
It IS important that you tell your dentist about your (or your child’s) diabetes. Diabetes has an impact on oral health.
I always ask people with diabetes when they last checked their blood sugar, what it was, and when they last ate, not
for purposes of judging them, but because I want to avoid a hypoglycemic episode.
I think DrBB is right - a lot of people think they are experts on diabetes when they know very little about it. This is especially frightening when people in medical professions act this way. My husband was hospitalized a number of years ago. After he had told the ER doctor that he had had TIDM for over thirty years and had an insulin pump, the nurse did a fingerstick. A few minutes later, she came in with a syringe. I asked her what she was doing. She said that the doctor had ordered her to give him an insulin injection because his blood sugar was high. I asked how he came up with a dose? She stated that he used a sliding scale. I mean, why would you ask someone who has had diabetes for thirty years about the dosing, when you can just use a sliding scale?!!! I asked her if she was trying to kill my husband and told her to get out.