I had a very similar story - two dentists with two opposite findings. Don’t know who to believe. Mexico sounds like a better choice.
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Chlorhexidine. It is a therapeutic rinse meant for a defined problem over a short course rather than an everyday product. A Cochrane review found high-quality evidence that chlorhexidine added to normal brushing produces a large reduction in plaque and a moderate reduction in gum inflammation. It also stains teeth with prolonged use, which is one reason it is typically prescribed for a defined period of around four weeks for a specific problem, such as after oral surgery or during active gum treatment, rather than used indefinitely. For that short-term, targeted use it is one of the more effective options available. As an everyday habit it carries the same nitric-oxide tradeoff described above along with the staining, for gum benefits that mechanical cleaning largely provides on its own, so the balance shifts against it when it is used continuously.
Right, be careful with powerful antiseptics like chlorhexidine as it indiscriminately kills oral bacteria, both bad and good. Great when one battles an oral infection or needs to prevent post-surgical infections, else I’d stay away from it.