How to tell if your front chainring is worn out

Comparison of very used and worn Shimano 105 front chainring versus a brand new replacement. The worn chainring looks like shark teeth. Shark teeth in this case are bad.
Here's a video from Park Tools showing another way to check your chainring: • Well Chomped Chainring...

[@5speed735i]

Nice video, it was quick and to the point, thank you. (Hah! Chainring tooth pun there)
You should also make a video on dangerous sidewall damaged to a tire, with a still shot taken at 1:03.

[@Wapiaries]

Haha, probably too late. That tire is in the city dump.

[@sophiescyclingandwalkingch4294]

I would be changing that tyre (UK) immediately. 😅

[@BillSF49]

I just experienced this for the first time. I don't have 20K, but around 10K miles. I am a heavier rider, so, that may make a difference. I felt the same "0 confidence" in my bike as you stated.

[@tpoljsak]

Excellent advice!

[@uniqueHandleName420]

My bad. I asked "how many miles did you get?" And then you answered it on video. ~20k. 😅. Good video. See you at KRG or Breckenridge?

[@Wapiaries]

Probably. Working on getting back into shape.

[@bikingchupei2447]

man the shimano 12 speed chains are trash compared to the 11, they get surface rust like crazy.

[@ibbjos08]

Thanks bro.

[@songofyesterday]

What about the inner ring on the back? Show us that too?

[@Wapiaries]

Hardly ever use it. It's fine. Only replaced the outer ring.

[@makantahi3731]

this chain ring is on half of life, it can be saved by teeth reshape

[@Xxiluv2snip3xX]

how do you prevent shark teeth?

[@Wapiaries]

Make you keep things clean, lubricated, and change out your chain before it is worn out (stretched).

[@makantahi3731]

you can not prevent it to not to happen but you can prolong teeth wear and from time to time reshape teeth on right shape