To a child of 1.4 years old. Has anyone experienced something similar …

To a child of 1.4 years old. Has anyone experienced something similar with teeth at this age? We've been brushing, we introduced children's toothpaste a couple of months ago. We're going to see a dentist, it's scary to think what they will say! It seems like we'll need to have a procedure under anesthesia. Please share your experience, if you had something similar!