Eating too little salt is as dangerous as eating too much salt. The usual recommendation is to eat about 4 to 5 grams of salt per day.
The salt consumption can be a problem when instead of cooking your food with known quantities of salt you buy already processed food, which almost always contains excessive quantities of salt and sugar, because these are very cheap ingredients, which not only reduce the production cost, but they also improve the taste.
So for those buying already prepared food, the normal risk is to eat too much salt. Those who make their own food, must also take care to not eat too little salt.