How can I teach my 1y/o to spit out saliva/ water during tooth brushing? She always laughs at me whenever I try to demonstrate it. LOL

Kids love to imitate what they see in adults. Yes, you just keep doing it and brush your teeth together. It will be fun for her as you do things together.

Just keep demonstrating it until she imitates you. Make sure to look like you're having fun to encourage her more! ;)

Just be patient and continue doing it with her seeing the act. Eventually, she'll learn how to spit them out. :)