Tantrums

I try to avoid using the word no because of this and say things in another way to get her to stop. An example is if she's talking with food in her mouth, instead of saying not to do that, I say "I can't hear you when you have food in your mouth" and there's a lot less resistance. When I slip up, say no and she finds it funny to repeat it, I completly change my tone so she knows I'm being serious and if she doesn't listen again, the consequence happens. Messing about with things she isn't meant to? She or it comes away. I can't say it's easy or my tactics work every time, but I find it makes life easier