Can tooth infection spread to other teeth?

well, I learned from 'Nutrition and physical degeneration' by Weston Price that cavities come from the modern diet, back in the 30's when a slice of stone ground rye and glass of raw milk provided all the nutrition needed back then....so, so much has changed and the word never got to food providers about the nutrition, we believe nonsense today.....and so many want diet information, and so more confusion is provided....but nutrition is today worse than ever, at providing real nutrition....and the consumer is hard pressed to find out what real nutrition is, and is it made any longer ? the nutrition in the food is what

causes degeneration and what really spreads the cavities.......

no.........................

They can.  If the cavity is between two teeth, the germs that are decaying the first tooth can make their way across into the second tooth.  Now, it has to find some kind of an opening in that second tooth to be able to get through the enamel, etc., that protects the tooth before it can infect it.  But having the decay right there 24/7 greatly increases the odds that it can find a way into the tooth.