Is it possible to fit an upper dental appliance if i still have 6 natural front teeth?

Yes: It is possible via an appliance called a removable partial denture. If one is appropriate for you it will have some clasping to your remaining teeth in the front and resemble a denture in the back. For this to be a success it is important to make sure your remaining teeth are healthy and strong enough to provide needed support. A dental exam should give you an idea if this is a good idea or not.

Yes: Yes it is possible depending on the condition of the 6 remaining teeth. If there is no periodontal disease and the bone support of the teeth is good, you could have a removeable partial denture fabricated. Other possible treatment would be to replace the missing teeth with implants. Consult your dentist for the best treatment plan.

Yes: Assuming the 6 teeth are healthy, an appliance can be built to clasp several of them for retention. It's called a partial denture.

Absolutely. As long as your teeth are healthy, and the bone and gums supporting the teeth are healthy, there is more than one solution. Please see your General Dentist for a thorough evaluation and a discussion off hour treatment options.