Have you tried giving him treats while brushing him? For Magnus, when I'm brushing his face (which he absolutely loathes) I hold a small piece of jerky for him to nibble at while I'm brushing. If he moves his head away, he won't get the treat so he "puts up" with it.
As for the spray... Again, both Magnus/Zoey HATES it. So instead of using the spray, I use a syringe. Hold their head and poke it in at the side of their mouth. Once that's just, I just rub their mouths a little to get the brushing effect. I find that bully sticks really do help their teeth clean. |