Why could a cardiac murmur be diagnosed in a place like a Dental Surgery than any other apartment?

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More than 5 million Americans are diagnosed with it every year. ... Heart valve disease can disrupt the way blood flows through the heart. ... found during an exam when the doctor listens to the heart and hears a heart murmur. ... health and any other heart-related surgeries that might be needed, such as bypass surgery.

fear from infectious endocarditis with valvular insufficiency due to  propagation of infection by blood from focus anywhere of organism particularly from dental infection caused by streptococcus epidermoidis ,or staphylococcus aureus,or anaerobis. 

I don't feel this question is exact unless Dentists use a stethoscope on every patient during their sessions. Not very common you could hear systolic murmur if you get close to the chest without using a stethoscope, unless the patient's heart condition (such as valve disease) is progressed to severe stage, then perhaps.

In my years of experience I haven't received a referral due to a heart murmur (valve disease) that was first diagnosed at a dentist. Usually these are found at GP, occupationa health for routine check up, or by the cardiologists ofcours.

On the other hand, before attempting an elective surgical itervention whether repair or valve replacement, we do refer patients to a dentist for check up and fix any dental issues prior to cardiac surgery but after the diagnosis is made (the murmur is already heard by few doctors and echo assessed) to avoid, as my colleague Dr  احمد محمد رضوان has mentioned, development of infective endocarditis.

for fear of infictive endocarditis       & A.B   prophylactic adminestration