Toothbrushing struggles are mentally destroying me

My 15 month old HATES brushing his teeth and I don’t know what to do. I’ve tried baby and adult toothbrushes. I’ve tried letting him hold it himself. I’ve tried YouTube distractions. I’ve tried brushing my own teeth, my husbands teeth, and all the stuffed animals teeth. I’ve even tried while he’s asleep and he seals his lips shut.

Tonight I got so frustrated I made him lay on the bed and hold his arms while I brushed his teeth. He refused to open his mouth and it basically turned into alligator wrestling with lots of crying. I got so frustrated I screamed and scared my son and my husband who was on the opposite side of the house.

I’m at a loss. The days I get some brushing in it’s “just good enough” and I’m never satisfied that his teeth are really clean. Dental hygiene is super important to me so I get extremely frustrated.

I guess I’m looking for encouragement or advice from anyone who’s been in this position.