BHA is used a lot because it stays stable in higher temperatures. In high doses, it has carcinogenic properties. I looked at the Milk Bones, budget friendly but terrifying ingredients. May I suggest trying Zuke’s Z-Bones grain free dental chews. My boys love the mini size, as a treat. Berry Crisp is the the best flavor. For actual teeth brushing, I use Virbac’s C.E.T. Enzymatic Toothpaste in vanilla mint flavor.