What has teeth but no mouth, can have pieces or cut? Sorry if this is bad it's my first riddle

In recent news, using words like hell demands that some deity immediately send you there for eternity. My boys can't stop laughing about the massive ballroom events they throw, especially when shortened for convenience and humorous form. Where Tesla and Edison disputed, I appear in two letter forms, with a slash you can't use here.

A tool of sorts, a sacrifice, perhaps even a queen! What is this thing, that can be USED, for many, many things?

In senior year of high school, there is often a day tied to this. Do this to someone on a date, and I truly hope you feel regret. At a restaurant, some think this is fun, like ringing a doorbell before cameras took charge.

I am born as a puddle on a scorching hot plate, But I flip in the air to seal my sweet fate. I wear a gold jacket, round, fluffy, and light, And I love to get drenched in the morning’s daylight. You can stack me up high like a tower of old, Then melt a square crown of yellow and gold. Drizzle me with amber from a maple tree’s heart, And breakfast is ready to be torn right apart.