Best of both worlds toothbrush: I have written about high-frequency vibration toothbrushes for several years now, and it has been a popular topic with readers. These toothbrushes use micro-vibrations to deliver an extremely effective cleaning that makes your teeth feel like you just went to the dentist. My own dentist said they are one of the biggest developments in oral care he has seen in his time practicing, and he even asked what kind of toothbrush I use when he commented about the excellent condition of my teeth! My experience shows the two things about toothbrushes that readers get most excited about are good performers that are under $30 and toothbrushes with a display screen that show where you miss when you brush. I recently found one that is both, and I was surprised to see a screen on a toothbrush so inexpensive. I had always figured you could get a nice toothbrush for $30, or a screen, but never both in the same package.

The Sakyproral G5S has an AI smart screen that not only shows you where you missed, it allows you to go back and finish the job in the same brushing session. I have not seen this feature before, and it is a game changer. The G5S includes two Dupont Diamond brush heads, which are my favorite and usually found only on higher-end toothbrushes. It also uses a simple charging cord that you plug into the toothbrush to charge it. I recently received correspondence from someone who had a toothbrush with a charging base, saying that when it got wet it overheated and smoked. I haven't experienced this myself with any toothbrushes and it was the only time I received such a comment, but it made me realize that just using a cord plugged into the toothbrush is simple and safe. Given you only have to charge it every 150 days, this keeps down complexity and clutter as well. The Sakyproral G5S performs excellently, much better than I would have expected given the price, and has a nice comfortable ramp-up with the vibrations when you use it.

Current pricing is $39.99 on Amazon, with a $10 discount code SAKY1010 which brings the price down to $29.99. It's the best deal I have yet to see on an advanced toothbrush of this type, and will introduce many new users to the benefits of an advanced toothbrush. Hopefully this trend continues!

Q. What is the part number for a new belt for my Sony PS-4300 turntable? How hard is it to change?

—B.S., St. Paul, Minnesota

A. The Sony PS-4300 is a direct drive turntable, so there is no belt to replace. If the platter does not turn the turntable needs to be repaired. Your automatic turntable is a vintage unit and parts may be scarce, but it is an excellent performer and worth fixing if the cost is reasonable and parts are available. If it is not fixable and you want to stay with the same turntable, you can get a used PS-4300 in working order for about $300, but then you still have an old turntable with a potentially limited lifespan. To get comparable performance from something new would cost $500 or more. If you want to stay with direct drive, Music Direct has the JBL TT350 Classic on sale for $699, reduced from $999. It's a beautifully styled and finished, solid turntable with excellent sound and is very good buy under $700. musicdirect.com

My top belt-drive turntable recommendation for $699 is still the Cambridge Audio Alva ST, which also has Bluetooth and a built-in phono preamp. cambridgeaudio.com

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