Periodontist said that tooth 15 may soon have to be pulled with no implant needed. it is last tooth in upper left quadrant. what do you think?

2nd molar: Tooth #15, upper second molar, is often not replaced with an implant. IT can be done however. Depends on your situation. Get another opinion.

Seek another consult: It's not unusual to go without replacing tooth #15 with an implant. The bone quality and quantity can be poor which would require more involved treatment to replace it. With #15 being a second molar, it is usually one of the four teeth receiving the greatest force. All things to consider. Seeking another opinion may help to put your mind at ease.

Depends on chewing: The occlusion needs to be evaluated by your dentist to see if your bite is comprised by the missing tooth. Best to consult with your dentist.

I agree: You may not need to replace #15, especially when you complete the restoration of 12-x-14 with implants and crowns. Think of it this way... you can always replace it with an implant in the future if you feel your eating efficiency has been reduced once it is extracted.

Reasonable but....: What was told to you by the Periodontist seems reasonable but without actually examining you & seen x-rays of both the upper and lower teeth on that side we cannot give you a proper definitive answer. Many things go into making these types of decisions such as bite, health of remaining teeth & supporting bone, parafunctional habits, chance of drifting of teeth and super-eruption of opposing tooth?

Perhaps: Depends on your occlusal scheme, how the teeth interdigitate. Sometimes loss of tooth in one arch leads to extrusion of opposing tooth. As your Family Restorative Dentist will have to deal with your tooth loss, ask your General Dentist to talk this over with your Periodontist and arrive at a consensus opinion.

See below: Need to clinically and radiographically evaluate. Do you have tooth # 16,17 and 18, many variables. Speak with your general dentist for a restorative opinion prior to the extraction so you have a definitive treatment plan.