HTR1A and bruxism: We found no positive association between subjects with sleep and awake bruxism and the SNP rs2770304 (p=0.5065), SNP rs4941573 (p=0.8885) and SNP rs1923884 of the 5-HT2A receptor gene (p=0.4933) and SNP rs6295 of the 5-HT1A receptor gene (p=0.3706).21