The first thing you will need to do is research brand names to find out which ones have the best reputation for being long lasting. While many toothbrushes will claim that they have a long life span, only a few brands produce a long life toothbrush that will survive the rigors of daily use. Well established brands such as Crest, Reach and Sunbeam all have the reputation of being able to handle the abuse many individuals put onto their toothbrushes.
Once you have established which brands you feel will have the longer life, you will need to investigate the various models and functions of the toothbrush. A long life toothbrush can have the added features and benefits of a more expensive brush, or can be simple and plain. This is where you must decide what you need in a toothbrush. More importantly, a long life toothbrush does not need to be expensive to be durable. Sometimes, you can get a cheaper toothbrush that can outlast one of the more expensive models. As with all things, there is a certain level of experimentation that you must do in order to find the best model for the cost right for you.
With a little research, you can find a long life toothbrush, such as the Crest extender toothbrush and many of the Reach toothbrush lines, that will last a long time while giving you the dental hygiene that you deserve