Demonstrating

"Tim how many times I told you to clean your teeth properly," shouted Tim's mother.
"Mummy I have cleaned my teeth properly," replied seven year old Tim who took less than one minute to clean his teeth.
Tim's sister Sare, who also wanted to clean her teeth, called Tim to the wash room. She gave Tim's bursh to him and took hers also. Then she press tooth-paste on both brushes and, started to bursh her teeth properly. Tim observed Sara and followed her. As Sara demonstrated how to clean the teeth, Tim find it easy to follow his sister.

Yes, demonstrating is a good method to guide your child.