Replaceable Brush Heads: Some cheaper electric toothbrushes are intended to be disposable and therefore do not come with replaceable brush heads. You definitely want to go for a toothbrush that has replaceable brush heads, because this means you will be able to use the toothbrushes for a Toothbrush very long time. Also, check to make sure you are able to easily buy new brush heads from most shops. Also check the price of the brush heads. It's no good paying a reasonable price for a quality electric toothbrush only to be charged the Earth just to replace the brush heads.