Lubricate your Oral-B 3D White Fresh 40 Medium Toothbrush with a small amount of water. Put a small amount of toothpaste - about the size of a pea - on the head of the toothbrush. Insert the toothbrush into your mouth at about a 45-degree angle to your gums and use gentle, short strokes to brush your front teeth. Brush the outside surfaces of your teeth, making sure to get the back molars and upper areas of your chewing surfaces. Flip the toothbrush upside down to get the inside surface of your top front teeth. Flip it back around to get the inside surface of your bottom front teeth. Also brush your tongue to get rid of any bacteria buildup or plaque that has gotten stuck there during the brushing process.