Teeth Whitening Techniques

I’m looking for a really really good Whitening Toothpaste that will brighten my teeth and remove stains before I go for cosmetic treatment next year. I chipped my two front teeth pretty badly a while back and the caps my dentist put on them don’t look amazing at the moment because it’s a fairly temporary job. As I understand, cosmetic veneers are matched to the shade of your surrounding teeth, so dentists recommend you Whiten Teeth before hand so you get pearly white veneers. There is no way to whiten veneers/caps so I need my teeth to be mint white by next December. I don’t smoke but I do drink a lot of tea and I’ve heard it contains tanins that can leave your teeth looking yellow and patchy. I have already tried Blanx and Pearl Drops but neither of them were that spectacular. I can’t afford laser treatment and I don’t want to damage my teeth or cause sensitivity, any ideas? And where can I get these guys from?