I've recently gotten a bit obsessed with candles and it's a pretty expensive obsession, so it's really annoying when the candles don't burn evenly. Bath and Body Works candles usually burn beautiful but once in a while, you get a bad one and it tunnels. Tunnelling basically means, only the inside burns and the outside stays solid, which will eventually drown the wick and once the wick drowns, you won't be able to use the candle anymore!
I always have problems with the 4oz, small candles (my 3-wick candles burn perfectly!) maybe it's because there's only 1 wick? Anyway, here are pictures to help you guys solve the annoying problem!!
Get a piece of foil, puncture a hole and put it over the candle tightly.
Take another piece and wrap the whole sides of the candle too
Burn for a couple of hours and.. viola! :) Just be patient and you will have perfectly even candles! YAY!