I got my teeth whitened last year not with mya with a company in liverpool on dale street called hollywood smiles or something, it was awful! I got told they was gonna go up to 7 or even 14 shades brighter, paid £150 for them to go 2 shades brighter, the women checked on the colour chart and they was 2 shades couldnt believe it, tryed to get my money back but they just offerd me another hour session so didnt go back in the end. I told my friends i got it done and they couldnt even tell. I would definitely go with a good company like mya next time even if it might be more expensive x