Sulphur odor every time I WaterPik between 2 new dental implants with crowns?

I recently (<1 mo) had 2 cosmetic crowns placed over dental implants on 2 adjacent teeth (#29). (implants placed months before) Now that crowns are on, EVERY time I WaterPik between them there is a strong Sulphur smell unlike any other mouth odor I've previously had from decay or stuck food, etc. And JUST when I am at those teeth. Not attractive & I hope not indicative of a major problem. This occurs even if using the Water Pik 2x daily - so this odor is 'developing' quickly. Any thoughts?