My daughter is 38 her dentist gave her a mouth swab to check for bacteria and the dentist advised her the swab revealed she is at high risk for colon cancer. this sounds like buffoonery to me that a dentist would advise a patient of this ?

You apparently are not as informed as your daughter's dentist is. Your daughter most likely has periodontitis.Certain oral bacteria make their way into the gut and alter balance of resident microbes. This orally-driven disruption promotes aberrant immune and inflammatory responses, eventually leading to colorectal cancer (CRC). ref: https://pubmed.ncbi.nlm.nih.gov/31450675/

RESEARCH HAS SHOWN THAT GUM DISEASE WITH MULTIPLE KINDS OF BACTERIA PRESENT ENTERS YOUR BLOOD STREAM AND CAN CAUSE MANY DISEASES. DIABETES, STROKE, HIGH BLOOD PRESSURE. AND SOME CANCERS. COLON AND PANCREATIC. IF SHE HAS GUM DISEASE THAN TREATMENT IS RECOMMENDED.