I'm trying to create a donut. I selected some points and scaled them down but after it, some part of the mesh (icing) vanished. This isn't inside the donut(torus), it is just missing (maybe). Please help me to solve this and explain the actual problem and how to avoid it in the future?
There is no more faces on this part, it's hard to tell how it happened, but now just fill the hole with some faces. First select these two edges:
Then right click > LoopTools > Bridge (enable the LoopTools addon) and choose 5 segments in the Operator box:
To make the vertices merge, press M > Merge by Distance, in the Operator box choose a Merge Distance of 0.001:
Fill the last faces with some F: