There are many different options of toothbrushes currently on the market. The most important things to look at before purchasing is: toothbrush head size and bristle softness.
Always look for a toothbrush with a smaller head – this will enable you to get to the back teeth and the hard to reach places a bit easier. Soft or ultra-soft bristles are also advisable, anything harder than this could potentially cause damage to the enamel tooth structure particularly if used with the incorrect technique.
A powered/electric toothbrush is a good alternative to a manual toothbrush. It can do a better job of cleaning the teeth, especially for those who have difficulty brushing or who have limited manual dexterity.