Having trouble getting into your baby or toddler's teeth to give them a brush? Use the mirror.
It's simple really. Make funny faces and get your little one to laugh, or at least grin. Once his or her mouth is open, let the brushing begin! As babies turn into toddlers, they discover their own faces in the mirrors and even 18 to 24 month olds will find watching their reflection interesting (ie. if I move the brush this way, so does the face in the mirror).