Eating melon seeds for a long time will lead to melon seeds on the teeth, which will affect the appearance. Secondly, eating melon seeds for a long time will increase the friction between the tongue and teeth, which will easily lead to symptoms of redness, swelling, pain, ulceration and blisters in the mouth. And most sunflower seeds will add essence, heavy metals and other substances when fried, which may cause cancer if eaten for a long time.