“What is the best toothpaste for receding gums?”

If by this you mean the teeth are sensitive from the receding gums then there are many toothpastes such as Sensodyne that are made just for this. If you are asking which toothpaste will stop receding gums the answer is none. To treat that problem a periodontist should be consulted. First you have to find the cause of the problem so you can then determine the best treatment for it.