According to studies and research, the more we practice, the size of the dendrites grows thicker with a fatty coating of myelin. Therefore, the thicker the dendrites, the faster will be the signals travelling.

With enough practice, the dendrites build a double connection. The faster, stronger and dual connections of dendrites last for a longer time, i.e. we remember what we learned. Thus, dendrites grow only when we are actively practising or doing something repeatedly.

https://byjus.com/biology/dendrites/