In order to get the job done right you must first start with using the right tools for the job.  The same can be said about your oral health care. Make sure to use toothpaste with fluoride and a soft-bristled toothbrush that fits your mouth comfortably.  

You may want to consider using an electric or battery-operated toothbrush, if you have arthritis or other problems that make it difficult to brush effectively. A side benefit is they can help to reduce plaque and a mild form of gum disease (gingivitis) more than manual brushing dose.