The answer splits on one question: do you sleep in them or take them out?
If you take them out — the usual advice
Most dentists recommend removing dentures overnight, to give the gum tissue a rest and reduce the risk of denture stomatitis and fungal overgrowth.
That creates a specific problem for taping, and it is worth understanding rather than guessing.
Without teeth in, the jaw over-closes. Dentures maintain what dentists call vertical dimension — the height of the lower face when the teeth meet. Take them out and the jaw rotates further closed than it was designed to, the chin comes forward and up, and the lower face shortens.
The lips change position. They lose the support the teeth were providing, so they fold inward and the skin around the mouth softens and creases. Adhesive on that surface behaves differently: more mobile, more folded, and the tape is likely to crease and lift.
The tongue has more room and sits differently, which changes airway dynamics — sometimes for the better, often not.
None of this makes taping dangerous. It makes it less likely to stay put and less likely to be doing what you think it is doing.
If you sleep in them
Mechanically much closer to the standard case. Vertical dimension is maintained, the lips sit where they normally do, and a strip across the lip seam has a normal surface to work with.
The complication is that sleeping in dentures is generally advised against, so this is a conversation with your dentist rather than a workaround to adopt because it makes taping easier.
Partial dentures
Usually the easiest case. Enough natural teeth remain to hold vertical dimension and lip support, so the geometry is close to normal whether the partial is in or out.
Same rule: follow your dentist's guidance on overnight wear.
The reason denture wearers ask
Worth naming, because it is usually the real driver: snoring frequently gets worse after tooth loss.
The mechanism is the over-closure described above. A collapsed vertical dimension changes the position of the tongue and the soft tissues of the throat, and for many people that narrows the airway. People notice their snoring worsening in the years around losing teeth, and reasonably go looking for a fix.
Tape is not really the answer to that. The answer is more often dental — a properly fitted denture worn appropriately, or in some cases an appliance that maintains jaw position. Worth raising with your dentist directly, because they can see what is happening to your bite. (How mandibular devices work, for comparison.)
What to do instead, or alongside
Talk to your dentist first. Snoring that appeared or worsened around tooth loss is a dental question before it is a sleep-product question.
Open the nose rather than closing the mouth. A nasal strip has none of these complications — it sits on the bridge of the nose, entirely unaffected by what is or is not in your mouth. If your nasal valve collapses on inhalation, TitanAir strips lift it with spring-loaded bands. (The ten-second test.)
Sleep on your side, which keeps the tongue base out of the airway and is free.
Elevate the head of the bed a few inches.
Cut evening alcohol, which relaxes the airway and is the biggest night-to-night variable in snoring. (What one drink costs you.)
The thing to rule out
Snoring that has worsened, particularly alongside daytime exhaustion, is worth getting assessed. Risk of obstructive sleep apnea rises with age, and tooth loss and apnea share several risk factors.
Witnessed pauses in breathing, gasping awake, morning headaches, or falling asleep unintentionally during the day all warrant a sleep study rather than a product. (How to decide.) And quieting the snoring while the airway still collapses is the outcome to avoid. (Why.)
If you do try it
Sleeping in a partial, or cleared by your dentist to tape:
Place the strip across the lip seam with a margin of skin above and below rather than centred on the lips, which sit differently without full tooth support. Use a gentle adhesive — Titan's bamboo silk tape is designed to release under modest force, which matters more when the surface is mobile. (The material testing is published.)
And do not tape after any recent extraction or with any healing wound in the mouth, until your dentist says you are healed.
The bottom line
Sleeping in dentures makes taping mechanically ordinary; taking them out changes the geometry of your lower face enough that tape is likely to crease and lift.
But the more useful point is that snoring after tooth loss is usually a vertical-dimension problem, which makes it a dental question. Start there, and use a nasal strip in the meantime — it is unaffected either way.