We've been using a particular tooth paste. But the one we bought last month seems to react some how. I had gum sore, I thought I wasn't washing my mouth very well. I put more effort, not knowing I was doing more harm. Not until my two sisters complain of thesame thing, I didn't stop using it. One of them suggests we opt for another brand. We stopped using that one. It was then clear that the tooth paste caused it. Since then, I've been using chewing stick because I dont want to send my teeth to early grave.