Choose the right brush
You should contact your dentist to find the toothbrush suitable for you, though most adults require a small or medium-sized toothbrush, with soft to medium, multi-tufted, round-ended nylon bristles.
Your brush head and bristles should be small enough to reach into the crevices of your molars, where food debris can hide after you eat, especially in the back of the mouth.
Children need to use smaller brushes but with the same type of filaments.