Buy toothbrushes with soft bristles. Medium and firm ones can damage teeth and gums. Use soft pressure, for 2 minutes, two times a day. Both powered and manual toothbrushes clean teeth well. Manual brushes with mixed bristle heights or angled bristles clean better than those with all flat, even bristles. Powered toothbrushes may be easier if you have trouble using your hands.
Remember to replace your toothbrush every 3-4 months. Change it sooner if the bristles look bent or splayed out. Bent bristles don't clean as well. (They're also a sign you may be brushing too hard.)
Toothpastes with the American Dental Association (ADA) Seal of Acceptance always have fluoride, which strengthens and protects teeth. If you want a non-fluoride option, stores carry toothpastes and powders made with natural ingredients that don't have ADA testing and approval.