I have used Plus white before and it works pretty easily, quickly and inexpensively...I usually purchase at Walmart for less than amazon.
Plus White 5-Minute Premier Speed Whitening Gel, 2.0 Ounce https://www.amazon.com/dp/B00BLVSZWW/ref=cm_sw_r_cp_apa_i_BRHPCbN85R5MJ
I’m using a whitening gel from amazon. I put it in a mouth guard. It’s like, identical to white strips in my opinion.
Can you order this? Amazon Canada link:
Plus White 5-Minute Premier Speed Whitening Gel 60 ml Box https://www.amazon.ca/dp/B00BLVSZWW/ref=cm_sw_r_cp_api_Jr3bAb84VHYJ1
This stuff is cheap, quick and works great
Plus White 5 Minute Speed Whitening Gel - Starts Working in Minutes - Effective at-Home Teeth Whitening - Easy to Use & Enamel Safe (2 oz) https://www.amazon.com/dp/B00BLVSZWW/ref=cm_sw_r_cp_api_i_3G3DPPCPJGMMPCQ3ECP3?_encoding=UTF8&psc=1
I bought Plus White 5 Minute whitening gel and was very happy with the results.
It didn't get my teeth like crazy blinding white, but it definitely brightened them up a bit and was cheap and easy to use. And also didn't ruin my enamel or anything like that. I was at the dentist last week and got nothing but compliments on my teeth.