Yes you can use saliva samples to extract DNA and perform SNP genotyping. A good one is Oragene kit, which can be kept at room temperature. Quite handy for easy http://www.dnagenotek.com/ROW/products/OG500.html,
Thank you all for your responses. Sabrina, which is more cost effective between Oragene and Norgen Biotek kits? I'm going to need for about 1,000 samples.I need more details including cost, yield.... Thanks.