For adult, or even children I would recommend that you use a soft toothbrush instead of a medium or hard. As a soft toothbrush has the best effect and least detrimental consequences to the enamel of the teeth. You should use the toothbrush in a 45o degree angle and not in a perpendicular angle and make sure you do not exert too much pressure on your gum or the teeth. Any toothpaste with fluoride is suffice and you should continue brushing for at least 3 to 4 minutes. I recommend at least 2 times per day brushing at morning and at night but brushing after each meal is also welcomed.
Dr. Kourosh Mehrabian