How do you make brushing teeth a fun time for toddlers?

What I do with my kid is, take him brushing at the same time when I do. And if I have done before him, I pretend to do it agin. Also, one more trick that works, which my husband doesn't approve of is, I have bought 7 toothbrushes for each day in a week. So, every morning, he is excited to check out which brush he has to do that day. Just a little money you have to invest in buying 7 brushes, but that sets the kid's habit for a lifetime. Else, I have come across people as old as 35 who do not brush their teeth regularly.