I accidentally swallowed my rubber bands for the braces. the elastics contains natural rubber latex. it dosen't say warning, so should i be worried?

Don't Worry: Those tiny little rubber band will pass right through your intestines. Just don't use them again!

Roughage: Will work its way out in the end. Nothing to worry about. And if you were allergic to latex you would have had symptoms from just the contact of handling and wearing the elastics properly. Latex allergy is a contact allergy. It's not like a food allergy where the food has to be ingested to cause a problem.