"Teeth are falling out, (but) the (kids) don't mind it because they get money. I messed it up with the very first tooth that came out. I gave 20 dollars," Klum said at an event for military moms, reported Peoples Magazine.
The 40-year-old said, "I had no idea. I thought 20 bucks was the right thing to do with the first tooth, but now with four kids and all of these teeth that are coming, it's another small fortune."
Talking about balancing her career and four kids - Lou, Johan, Henry, and Leni, the actress who has appeared on TV shows including 'Sex and the City' and 'How I Met Your Mother' said she has to be a good planner.
"Sometimes it's the other way around, where I have night shoots and then I'm there with the kids in the morning."
Reacting to what has surprised Klum the most about being a mom, she says, "How much you can love and that you can love them all equally the same. Because you do get worried, 'Am I going to love one more than the other?' But you don't. They're just all amazing.