Yes you can eat sweet potatoes everyday if you want too as they are very healthy and nutritious.
Sweet potatoes can be eaten everyday as much as you want but if you do eat too many sweet potatoes it might give you stomach cramps and diarrhea.
However other than getting stomach cramps or diarrhea eating sweet potatoes everyday or as much as you want to is perfectly okay.
But you might get tired of eating sweet potatoes everyday which I know I would.
Unless sweet potatoes was all I had to eat then I would not want to eat any one food everyday including sweet potatoes.
Sweet potatoes are packed full of vitamins, minerals and other nutritious things that we all need for optimal health.