I don't brush my teeth regularly
I forget to brush my teeth for months and years. The toothbrush is scratching my gums and the tooth paste leaves unpleasant aftertaste in my mouth and feeling of dry mouth or tingling. If you wonder what will happen If you don't brush teeth the answer is nothing. They will function fine. The plaque doesn't build up. It's just the same quantity of plaque every day over and over again.