Since Brain Freeze starts after you swallow, you can actually prevent it by holding the cold substance against the roof of your mouth before you swallow. But this technique seems so illogical most people won’t even try it!
When you eat your treat you don’t want to keep it on your tongue and wait for a couple minutes until it melts. You want to eat it and swallow when it gets in your mouth. There’s such a thing as being patient, but when it comes to ice cream you shouldn’t have to be.