I have a had a sweet taste in my mouth since Lower Facelift procedure - Possible nerve damage?

Facelift surgery is highly unlikely to change your sense of taste since the nerves that control your sense of taste are in a much different plane than where facelift surgery is performed. You were right in seeing an ENT and dentist since a change in taste could come from tartar between teeth (when starchy food is broken down by enzymes in your mouth into simple sugars), or from changes to the nerve that controls taste which courses from the brainstem through the middle ear down into the neck before reaching your tongue. The other thing would be to make sure it is not a change in your sense of smell since those are intricately related and effect each other. An ENT would be the right doctor for this as well.

In looking at the location of dissection for any facelift, it is unlikely that your problem is due to nerve injury. All nerves responsible for taste are in a different location. However, depending on what was done to the SMAS or parotid, salivation could’ve been affected but I know of no way to directly test for this.