I just recently went to a new dentist for a checkup and cleaning and asked him to check a cap that that was put on one of my front teeth by my former dentist. He informed me that I did not have a cap on any of my teeth. I know my last dentist fixed a broken front tooth and said he capped it. Who should I believe?

You have just experienced one of a number of common misunderstandings we see in dentistry today. Terminology used in dentistry is not 100% uniform throughout our profession. Both dentists were probably “correct”.
The word “cap” as used in dentistry by different dentists can refer to a number of different things. A pulp cap refers to a calcium containing dressing placed under a deep filling to stimulate healing. A full crown, made by a dental laboratory which completely covers the outside of your tooth is frequently called a cap. A partly broken tooth may be built up by your dentist in the office with a bonded filling material. This is called a cap or “”capping”” by some dentists. This sounds like what you probably had done.