How do you know if you have tonsil stones

[Happybee09]

Tried googling but obviously it only brings to the really obvious ones
I suffer with bad breath so think it could be this, I've only ever taken a good look at my tonsils when I've been ill though so not sure what they look like normally

Pic isn't very clear but on the right side you can just make out what looks a bit white - is that stones?
Have had a little prod with a cotton bud but it's just made me heave