Please explain if it is really bad to swallow tooth paste?

Toothpaste: Swallowing a little toothpaste while you are brushing your teeth is normal and nothing to, worry about. Eating toothpaste on the other hand is not a good thing as the Fluoride in it can cause an upset stomach. This is much more of an issue if you are talking about a small child eating a lot of toothpaste.

No: At your age, not really. Young children should not because we don't want them to get too much fluoride.

Not bad but : Not encouraged as excess flourid in paste can have potential harms.

Not a problem: Potentially toxic dose = 6 mg of Fluoride per kg of body weight. For a 70 kg adult, the lethal dose of 4.2 grams of Fluoride would require swallowing at least 4 liters of toothpaste, or 20 whole 200 ml tubes of toothpaste, which is impossible. You are safe.

It's not a good : Habit to routinely swallow it, but if it's an isolated occurance there should be no problem. Hope this helps.

Not food: Won't hurt you, it's not toxic, but it isn't too smart. Toothpaste isn't food. Use exactly as directed on the label.