How much toothpaste must be swallowed before a sodium fluoride overdose?

A lot. An adult would need to swallow more then an entire tube of toothpaste before you could "overdose" on fluoride. You would throw up long before that happened. You only need a pea sized amount of toothpaste to get your teeth clean, so I wouldn't really worrty about this.
Depends. It depends on toothpaste Fluoride concentration. To prevent it, children must be supervised until healthy toothbrushing habits have developed.
Depends. This is hard to answer because it depends on what toothpaste, what Fluoride chemical is used in it and how much you weigh. It's best to swallow as little as possible.

Related Questions

What amount of toothpaste must be swallowed to cause a sodium fluoride overdose?

A Lot. Unless you make a meal out of it, I would not be worried. Swallowing a small bit of toothpaste while brushing your teeth will have no affect on your overall health. The actual amount depends on the concentration of Fluoride in the toothpaste and your weight, which we do not know.
Depends. The concentration of Fluoride in toothpaste can vary however, you would have to swallow a very excessive amount over a significant period of time. You would probably get sick to your stomach and vomit first. Call your dentist with specific concerns.

How much toothpaste must be swallowed to cause a fluoride overdose?

Depends. It depends on toothpaste Fluoride concentration. To prevent it, children must be supervised until healthy toothbrushing habits have developed.
A lot. It's almost impossible to get a Fluoride overdose unless you are eating toothpaste on purpose. You can't get a Fluoride overdose from swallowing toothpaste during normal brushing with a pea sized amount of toothpaste. Children can sometimes eat toothpaste and get a mild Fluoride overdose. Keep toothpaste away from children just like any household chemical. If too much toothpaste ingested, go to er.