Lots of controversy on this'un. Like all medical practice, there will be doctors and dentists that cling stubbornly to old ways. If its any comfort to you, the dose of antibiotics before teeth cleaning isn't as likely to foster resistance as the full course of antibiotics a dr might prescribe for a cold or other viral illness, which I'm afraid some still do to get the patient to shut up, nor that same patient taking half the full course that he actually needs because he started to feel better. As I understand it, the rationale for a dose of antibiotic drugs before a procedure (including what we were all given when we had surgery) is to reduce the number of circulating bacteria with a quick blow while there's increased vulnerability (open surgical wound) or when there's an anticipated surge of bacteria (getting all that nasty gunk off your teeth and into your bloodstream via your bleeding gums.) In a perfect world aseptic technique in OR would be flawless, and we'd all floss our teeth every day and have gentle dental hygienists and that would be enough risk reduction.
And, having said that, dental work probably doesn't cause many or any infected implants anyway, nor do the prophylactic antibiotics prevent them. You will probably do fine if you take good care of your immune system and eat your fruits and vegetables. Stay out of hospitals and doctor's offices. They are full of sick people. Wash your hands. Boring stuff like that is plenty proactive.
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