your teeth - i used to bite the acrylic off when it was lifting and it would shatter and my teeth would hurt lol... I was a chronic nail biter until the start of the year. I had gotten acrylics and gels (honestly I couldn't tell the difference) and always bit my nails again afterwards until the start of the year when I got them done for a wedding and something clicked and I have never bitten them again! (There is no way you'd be able to bite through fake nails - unless you bite around your nail in the skin not the actual nail). I also had to get acrylics because I bit my nails so badly that the woman doing them didn't think the gel would stay on. I'm so glad that I stopped biting my nails - but its still so hard to get them growing - the fakies wrecked my nails (they were so soft and kept breaking) and really discoloured them so be prepared to have to put more maintenance into them once they fakes come off!! (But its a good thing) I paid about $50 for a full set of acrylics (inner city Melbourne) which was cheaper than I remembered. Gels were about $5-10 more though.