So far a LOT of references to labradors!
Tooth brushing number 1 .... anything else more of a adjunct...

Risks of antlers etc... HARD rule of thumb ... soft enough to make an indention with thumbnails... big bones too hard eg knucklebones, risk is teeth are scraping up and down ( fine...) but in between pointy teeth = pressure = wrong angle and broken teeth. Increased risk of fracture not worth benefits of giving ( hard bones etc..)
Tooth paste is fine... not human...vet specific...
Toothpaste more of a lubricant, "brushing" more important but acknowledges flavour makes experience more pleasurable ( mentions labradors again!!!! )