This is a message board, not a live chat, it may take even a few hours to get an answer to your questions, especially if they are obscure or at times when no one is around. please be patient!
No, you don't brush your pigs teeth, as they continually grow all the time, unlike a dog or a humans. Every couple of months, your pigs will replace their teeth!
However, there are things you can do for good oral care, such as feed them unlimited grass hay, this helps wear down the teeth as it is abrasive. If they don't wear them down, they may overgrow and the pig cannot eat, requiring an expensive (and painful) tooth trim from a vet.
Also, don't feed them mixed pellets with seeds / nuts / dried fruits and veggies. These can stick to the teeth and cause problems, or they can choke on them. Occasionally it is ok to feed them a single raisen, like a couple times a month, but that the quantity they can have as far as dried fruits go!
You also want to make sure that you check the front teeth once a week to make sure they look "good", not chipped, broken, or too long / misaligned etc.