A splint and a mandibular advancement appliance are very different oral appliances. They treat different conditions. A splint is usually used to assist in the treatment of tooth grinding, jaw clicking and/or jaw pain. Some splint designs may actually exacerbate snoring. A mandibular advancement appliance is specifically use to treat snoring and/or sleep apnoea. It may also assist in reduction of tooth wear due to grinding as the teeth are usually covered by the appliances.