Start with Both: For individuals new to night guards, it's advisable to initially try both upper and lower guards to determine which one is more comfortable and effective.
Preference for Upper Guards: Many people find upper guards to be less obtrusive and prefer them. A single night guard, either upper or lower, is generally sufficient for teeth grinding unless advised otherwise by a dentist.
Considerations for Choosing Upper or Lower:
Gag Reflex: If you have a severe gag reflex, a lower guard might be more comfortable and less likely to induce gagging.
Braces or Retainers: Choose the arch without braces or a permanently cemented retainer, as the impression putty can't be applied to teeth with braces, and a night guard could interfere with a retainer.
Dental Health Issues: If you have loose teeth, sores, or dental problems on a particular arch, it's recommended to use the night guard on the opposite arch to avoid exacerbating these issues.