I've always rinsed with apple cider vinegar for many reasons and does a decent job of keeping the grille clean, natural, not brilliant white.
laser whitening is fast, precise, and non-invasive, the downside; more expensive and can promote tooth sensitivity, whatever that means...
https://www.newmouth.com/blog/laser-teeth-whitening/
laser whitening is fast, precise, and non-invasive, the downside; more expensive and can promote tooth sensitivity, whatever that means...
https://www.newmouth.com/blog/laser-teeth-whitening/